Russia has been accused of war crimes after a missile attack killed 11 and obliterated a school.
Ukrainian president Volodymyr Zelensky accused Russia of the atrocity after videos and images appeared to show a bloody bombing of civilians.
The bombing left 11 dead after a barrage of rockets rained down over residential areas of Kharkiv, Ukraine ’s second largest city which has a notable Russia-friendly population.
The midday attack killed at least 11, including three children and more shelling levelled a school.
So far during the six-day Russian onslaught, Kharkiv has held out against invaders even though it is only 25 miles from the border.
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But the continued resistance has reportedly pushing Putin and the Kremlin to deadlier methods, such as this blitz against the city’s 1.5million people.
In a late night address to Ukraine, Zelensky accused Russia of war crimes.
He said: "Today, Russian forces brutally fired on Kharkiv from jet artillery. It was clearly a war crime.
"Kharkiv is a peaceful city, there are peaceful residential areas, no military facilities.
"Dozens of eyewitness accounts prove that this is not a single false volley, but deliberate destruction of people: the Russians knew where they were shooting.
"There will definitely be an international tribunal for this crime — it's a violation of all conventions. No one in the world will forgive you for killing peaceful Ukrainian people."
This morning, there was fighting on the city’s streets between the forces and there was another attack on an administrative building in the city that came prior to the deadly midday blitz.
This earlier attack injured six including a child and came after Justice Secretary Dominic Raab said that those responsible for war crimes could face trial for their actions.
Regional governor Oleg Sinegubov said: "Russian occupiers continue to use heavy weaponry against the civilian population."
Ukraine's foreign minister Dmytro Kuleba said: "Barbaric Russian missile strikes on the central Freedom Square and residential districts of Kharkiv. Putin is unable to break Ukraine down.
"He commits more war crimes out of fury, murders innocent civilians. The world can and must do more.”
This comes during the sixth day of Russia’s invasion, as Belarus has become the second nation to attack Ukraine.
It emerged today that Belarusian troops had crossed the border south into Ukraine to join the attack.
It came only hours after Belarus’ president Alexander Lukashenko, claimed he had no plans to join the war.
The known Putin supporter was quoted on Tuesday denying that Russian troops were attacking Ukraine from Belarusian territory.
Putin is now ramping up his attack after the Ministry of Defence said that logistical errors continued to hamper Russian efforts.
Kyiv’s envoy to Britain, Vadym Prstaiko warned that Putin could try to starve Ukrainians and “crush” their resistance.
He warned Ukrainians were struggling to access cash as Kremlin forces encircled major cities.
Asked about the potential for a “food crisis” and looting, the diplomat told the Commons Foreign Affairs Select Committee: “They will try to crush the will of the Ukrainian people to resist.
“We see problems with cash for example - people just running out of cash and they have interruption in their services.
“The terminals won’t be working and we will have to come up with some military solution to the distribution of food.”
