Ukrainian President Volodymyr Zelenskyy has called for further investigation into the missile that struck neighbouring territory in Poland, after NATO, Poland and the US concluded it was likely launched by Ukraine's air defences.
This blog has now closed, look back over the day's developments.
Key events
Live updates
By Lucy Sweeney
Let's recap the latest developments in Ukraine
It's past 1am in Poland and 2am in Ukraine, so developments are slowing down. We'll wrap up our live coverage here for now, but first let's catch up on what we've learned so far this morning.
- Poland, NATO and the US say their best information suggests the missile that struck a Polish village was likely a Ukrainian air defence missile launched in response to a barrage of Russian missiles
- There is no suggestion from any of these parties that Ukraine is at fault, with all of Ukraine's allies laying the blame at Russia's feet
- Ukrainian President Volodymyr Zelenskyy has called for further investigation into the incident, and wants his specialists to be allowed access to the site and all the data available
- Russia has dismissed the suggestion that it is ultimately responsible for the strike in Polish territory, telling the UN Security Council "we have long ago stopped being surprised by your attempts ... to blame Russia for everything".
We'll continue to update you on this situation as it progresses. Check out all our coverage on the war in Ukraine on the ABC News homepage.
By Lucy Sweeney
Ukraine's ambassador tells UN that defeating Russia is the only solution
Polish and Ukrainian ambassadors also spoke at the UN Security Council meeting in New York earlier.
Ukraine's ambassador to the UN Sergiy Kyslytsya told the Security Council:
"It is clear that the Russian war of aggression against Ukraine, with regular missile terror as one of its core elements, remains the only root cause of violence and human suffering in Ukraine and beyond.
"As soon as Russia is unable to continue its war, security in the region will immediately be restored."
Poland's Krzysztof Szczerski added:
"Those innocent people would not have been killed if there had been no Russian war against Ukraine.
"Their only fault was the fact that they lived close to the civilian infrastructure on the Ukrainian side of the border that Russia keeps attacking as military targets."
By Lucy Sweeney
UN members say Ukraine 'had every right to defend itself'
As foreshadowed in Volodymyr Zelenskyy's address, there's been a meeting of the United Nations Security Council to discuss the recent developments in the Ukraine war.
The United States and its allies have used the meeting to criticise Russia over the missile attacks it launched on Ukraine on the day that the missile crashed inside Poland.
The US ambassador to the UN, Linda Thomas-Greenfield, told the Security Council:
"This tragedy would never have happened but for Russia's needless invasion of Ukraine and its recent missile assaults against Ukraine's civilian infrastructure.
"Ukraine has every right to defend itself against this barrage."
The British and Polish ambassadors to the UN shared similar sentiments, arguing Russia was ultimately to blame for the explosion in Poland.
Russia's UN ambassador Vasily Nebenzya told the meeting:
"We have long ago stopped being surprised by your attempts in any circumstances, in spite of facts or common sense, to blame Russia for everything."
By Lucy Sweeney
Ukraine wants access to the site of the missile strike
Here's Ukrainian President Volodymyr Zelenskyy's latest address, (we've added English captions to this video).
He says:
"The Ukrainian position is very transparent: we strive to establish all the details, every fact.
"That is why we need our specialists to join the operations of the international investigation and to get access to all the data available to our partners and to the site of the explosion."
By Lucy Sweeney
'The world knows that Russia bears ultimate responsibility for this incident'
North America correspondent Carrington Clarke spoke with ABC News Breakfast earlier this morning with an update on the US position regarding this latest development in Ukraine.
He mentioned and address by secretary of defence Lloyd Austin and chairman of the Joint Chiefs, Mark Milley.
Lloyd Austin told a news conference earlier "the world knows that Russia bears ultimate responsibility for this incident … [it] is yet another reminder of the recklessness of Russia's war of choice".
Here's more from Carrington:
"The US says it has investigators on the ground in Poland helping to assess what happened, looking at the trajectory and exactly what exploded, and says it remains open to those findings, but it is supportive at this point of that early assessment from the Polish government.
"It was also clear from the two top members of the US military that they wanted to reiterate that they remain fully supportive of Ukraine and they remain committed to providing Ukraine with the military hardware it needs in its defence against Russia, in particular around air defence systems."
The US has donated a huge amount of high-tech military equipment including the NASAMS air defence system, which they say is performing extraordinarily well — "a 100 per cent success rate", but they say more is obviously needed to ensure Ukraine has control of its skies.
By Lucy Sweeney
US 'does not have information that would contradict Poland's findings'
As discussed, the Ukrainian President remains adamant that the missile strike that landed in Poland was not launched by his air services.
A US State Department spokesperson in Washington says the conclusions that Poland, NATO and US officials have come to is based on their best information.
"We are aware of President Zelenskyy's comments … but we do not have any information that would contradict Poland's preliminary findings."
The incident occurred while Russia was firing dozens of missiles at cities across Ukraine, targeting its energy grid. Ukraine has described it as the most intense barrage of strikes in the war so far.
Ukraine says it shot down most of the incoming Russian missiles with its own air defence systems. Ukraine's Volyn region, just across the border from Poland, was one of the many Ukraine says was targeted.
The Russian Defence Ministry said none of its missiles had struck closer than 35 kilometres from the Polish border, and that photos of the wreckage in Poland showed elements of a Ukrainian S-300 air defence missile.
Poland has said it was probably an old S-300 rocket, a Soviet-era missile system being used by both Russia and Ukraine.
By Lucy Sweeney
Ukraine wants more assistance for a 'missile shield'
Ukraine's President Volodymyr Zelenskyy has been calling on Western allies to help him build up a "shield" against Russian missile attacks.
And he's kept up that request in his talks with G20 leaders this week.
This idea of a "shield" refers generally to a defence system, weapons or technology that can detect, track and intercept incoming missiles.
Here's some more detail from Defence correspondent Andrew Greene about what that looks like in Ukraine.
By Lucy Sweeney
Photos from the site of the strike
Here are the latest photos from the Polish village of Przewodow, where the missile landed.
By Lucy Sweeney
US security officials tried to speak with Russia after the strike
A top US military officer says he tried to reach out to his Russian counterpart after the missile that struck Poland, but wasn't able to get through.
Army General Mark Milley, chairman of the Joint Chiefs of Staff, said his staff tried to get Russia's top-ranking military official General Valery Gerasimov on the phone, but had "no success".
Several US defence officials told AP it isn't unusual for General Gerasimov to not be available for a call. But given how high tensions are right now, it raises concerns about high-level US-Russian communications in a crisis.
A strike against Poland, a NATO member, could have snowballed into a larger conflict if it turned out that Russia had launched the strike.
John Tierney, director of the Center for Arms Control and Non-Proliferation in Washington DC, said open lines of communication "are vital if we are to avoid the risk of conflict caused by misconception, miscalculations or mistake".
General Milley did talk to his military counterparts in Ukraine and Poland.
By Lucy Sweeney
Albanese used G20 meeting with Xi to flag Ukraine concerns
Australian Prime Minister Anthony Albanese is at the G20 leaders' summit in Indonesia this week.
He held a meeting on the sidelines with Chinese President Xi Jinping, the first such talks since 2016.
Among the topics they discussed were climate change, trade, and human rights, with Mr Albanese also taking the opportunity to raise the conflict in Ukraine.
He said G20 leaders were acutely aware of the role Mr Xi could play in the war.
"I used the opportunity of the bilateral with President Xi to encourage him to use his influence to promote peace, and to pressure Russia into withdrawal from Ukraine," the prime minister said.
"That's the solution here."
Russia is likely to continue to dominate discussion at the APEC summit in Bangkok.
Here's the latest from Matthew Doran, one of our reporters at the summit in Bali.
By Lucy Sweeney
Western leaders still find Russia ultimately responsible
It's worth noting that although NATO and Poland believe this missile was most likely launched by Ukrainian air forces, they say ultimately Russia bears responsibility.
NATO Secretary-General Jens Stoltenberg said that Moscow, not Kyiv, was still to blame for starting the war in the first place with its February invasion and launching scores of missiles on Tuesday that triggered Ukrainian defences.
"This is not Ukraine's fault. Russia bears ultimate responsibility as it continues its illegal war against Ukraine," he said.
Western leaders at the G20 summit in Indonesia also suggested that whoever fired the missile, Russia and President Vladimir Putin would ultimately be held responsible for the incident.
By Lucy Sweeney
Some relief in Poland over missile findings
The news that Western officials had concluded the missile was Ukrainian has brought some relief to the inhabitants of the Polish village hit by the missile, with some saying they had feared being dragged into the war.
"Everyone has in the back of the head that we are right near the border and that an armed conflict with Russia would expose us directly," said Grzegorz Drewnik, the mayor of Dolhobyczow, which includes the village of Przewodow.
"If this is a mistake of the Ukrainians, there should be no major consequences, but I'm not an expert here."
By Lucy Sweeney
Zelenskyy 'has no doubt' it was not a Ukrainian missile
Here's what NATO chief Jens Stoltenberg had to say, followed by Ukrainian President Volodymyr Zelenskyy.
"I have no doubt that it was not our missile, and not our missile strike," the president said.
"I have no grounds to doubt them, we've been fighting the war together, alongside them and you.
"We should be part of a joint investigative group, shouldn't we? Especially if there is talk about us being the ones to blame. This is our right, isn't it?"
By Lucy Sweeney
Here's what we know
- Poland and NATO's Secretary-General have both said the deadly missile strike in Polish farmland appears to be unintentional and probably launched by Ukrainian air defences
- Ukraine's President Volodymyr Zelenskyy disputes this, and has called for further investigation
- US President Joe Biden says it was "unlikely" that Russia fired the missile, saying: "I'm going to make sure we find out exactly what happened."
- Three US officials speaking to AP on condition of anonymity say preliminary assessments suggest the missile was fired by Ukrainian forces at an incoming Russian one
- Mr Zelenskyy said Russia's missile bombardment on Ukraine had left about 10 million Ukrainians without power
By Lucy Sweeney
Poland and NATO say the missile strike wasn't a Russian attack
The Polish president and head of NATO have concluded a deadly missile strike near Poland's border with Ukraine was not a Russian attack.
The missile struck the village of Przewodow on Tuesday, killing two people at a grain facility.
It was the war's first deadly spillover into NATO territory, and both Poland and the military alliance say the missile was likely launched by Ukraine's air defences.
Let's catch up on all the developments that unfolded overnight.
