Liz Truss is set to attend crisis talks today about the escalating situation in Ukraine, following Russian strikes on Kyiv and the country's other major cities.
G7 leaders are set to attend a virtual meeting after 11 people died and 64 were injured in the strikes.
Moscow launched the attack in retaliation to what Vladimir Putin has described as a "terrorist" act by the Ukrainian special services, which took place on a bridge that linked Russia with Crimea
Some have labelled Putin's claims as an act of desperation, in response to the strong Ukrainian resistance to his attacks.
International outcry has been swift in the wake of the assault, with the G7 meeting due to take place later today. Ms Truss is also expected to call for a Nato meeting later in the week.
Ukrainian President Volodymyr Zelensky will participate in the virtual meeting, after speaking to the Prime Minister and other world leaders.
It is expected that Ms Truss will urge her fellow G7 leaders to “stay the course” in the battle against Mr Putin.
“The overwhelming international support for Ukraine’s struggle stands in stark opposition to the isolation of Russia on the international stage,” she is expected to say on Tuesday.
“Their bravery in the face of the most brutal acts of violence has earned the people of Ukraine global admiration. Nobody wants peace more than Ukraine. And for our part, we must not waver one iota in our resolve to help them win it.”
Discussions are set to take place over the global energy crisis, which has been sparked by the Russian invasion. Plans are also being discussed about introducing a global cap on the price of Russian oil, in a bid to target Mr Putin’s revenues.
At the start of the week, Mr Zelensky said that Ukraine counts on the UK’s “leadership in consolidating international political and defence support for Ukraine, in particular regarding the protection of our skies”.
Ms Truss has confirmed that she will be following in the footsteps of her predecessor Boris Johnson, intending to offer her continued support for Ukraine.
The country has called for help from western allies, requesting anti-air and anti-missile systems in response to the Russian attacks.
The attacks targeted Kyiv, while civilian areas and energy infrastructure were hit across the country, from Kharkiv to Lviv.
Mr Putin claimed that it was in retaliation for what he called Ukraine’s attack on the Kerch Bridge, a crossing between Russia and the annexed Crimea region. He also expressed that if Ukraine continues to mount “terrorist attacks” on Russia, the Kremlin’s response will be “tough and proportionate to the level of threats”.
Joining Ms Truss's support of Ukraine, Labour leader Sir Keir Starmer condemned Russia’s actions, calling the attacks “unjustifiable”.
“The UK is firmly united in condemning Putin’s latest wave of violence and destruction,” he said.
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