Sir Keir Starmer has ruled out talks with Russian tyrant Vladimir Putin as he urged European allies to “double down” on support for Ukraine.
The Prime Minister will tell world leaders in Brazil that the 1,000th day of the war should prompt them to go “further and faster in their support of” Kyiv.
Sir Keir is expected to urge US President Joe Biden to sign off on Ukrainian troops firing British-made Storm Shadow missiles deep into Ukraine.
The West’s support for Ukraine has been drawn into sharp focus again after German Chancellor Olaf Scholz spoke with the Russian dictator last week.
Kyiv has branded some of Mr Scholz’s comments as akin to appeasement.
Sir Keir said: “It’s a matter for Chancellor Scholz who he speaks to. I have no plans to speak to Putin.
“We are coming up to the 1,000th day of this conflict on Tuesday – that’s 1,000 days of Russian aggression, 1,000 days of huge impact and sacrifice in relation to Ukrainian people and recently we’ve seen the addition of North Korean troops working with the Russians, which does have serious implications.
“I think on the one hand it shows the desperation of Russia but it’s got serious implications for European security and for Indo-Pacific security.
“That’s why I think we need to double down on shoring up our support for Ukraine and that’s top of my agenda for the G20.
“There’s got to be full support for as long as it takes and that certainly is top of my agenda, shoring up that further support for Ukraine.”
Sir Keir again dodged questions over British demands for Ukraine to be allowed to use Storm Shadow missiles.
Kyiv is said to be concerned that without America, Western support will ebb away.
On Friday, Ukraine’s President Volodymyr Zelensky said: “Olaf’s call has opened a Pandora’s box.
“Now there may be other conversations, other calls.
“This is exactly what Putin has long wanted. It is extremely important for him to weaken his isolation.
“I don’t think Putin wants peace at all. But that does not mean he doesn’t want to sit down with world leaders … and it benefits him to sit down, talk and not reach an agreement.”
Mr Zelensky has also said new President-elect Donald Trump will help end the war faster.
He added: “We must do everything we can to ensure this war ends next year.
“We have to end it by diplomatic means.”
Mr Scholz defended his phone call with Putin before leaving for the G20, insisting it was “important” to signal the West will continue to support Ukraine.
Britain has also faced questions over its support for Ukraine, with Kyiv said to have become increasingly frustrated with the slowing down of military support.
Labour is accused of not supplying any Storm Shadow missiles to Kyiv, even to strike targets in Crimea or the Black Sea.
Russia unleashed its largest air strike on Ukraine in almost three months on Sunday, launching 120 missiles and 90 drones that killed at least seven people and caused severe damage to the power system, officials said.
Ukrainians had been bracing for weeks for a renewed Russian attack on an already hobbled energy system, fearing long winter blackouts and mounting psychological pressure almost 1,000 days after Russia launched its full-scale invasion.
