Ukrainian President Volodymyr Zelensky is expected to come to the UK this weekend, the PA news agency understands.
It is thought that Mr Zelensky is planning to make the trip as Prime Minister Sir Keir Starmer is due to host a summit of European leaders to discuss defence.
US President Donald Trump has also said that Mr Zelensky will visit the White House on Friday to sign an economic deal that will include US access to Ukrainian rare earth minerals.
At a press conference in Downing Street on Tuesday, the Prime Minister said he is hosting “a number of countries” for defence discussions this weekend.
Sir Keir said: “I have spoken to President Zelensky a number of times.
“I spoke to him on Wednesday night, as the democratically elected leader in Ukraine, I spoke to him again on Saturday.
“I have spoken to President Macron this afternoon on his return to France, and I am hosting a number of countries at the weekend for us to continue to discuss how we go forward together as allies in light of the situation that we face.”
The proposed visit will come after the Prime Minister’s trip to Washington for crunch talks with Donald Trump.
French President Emmanuel Macron pushed for security guarantees to enforce peace in Ukraine as he preceded Sir Keir in meeting US President Mr Trump this week.
The UK upped its defence commitments days before the meeting between Sir Keir and the US leader – promising to spend 2.5% of GDP on defence by 2027 – after Mr Trump had been calling on Europe to put more towards defence.
However, the PM has hit back about accusations the Government was playing “silly games” over the figures.
Defence Secretary John Healey suggested the real-terms increase in defence spending year on year “would be something over £6 billion”, compared with the £13.4 billion figure cited by the Prime Minister.
Conservative Party leader Kemi Badenoch pressed Sir Keir after the Institute for Fiscal Studies (IFS) accused ministers of playing “silly games with numbers”, over their claim that the defence spending increase to 2.5% of GDP by 2027 would mean £13.4 billion more would be spent on defence every year.
“If you take the numbers for this financial year and then the numbers for the financial year 27/28 that’s £13.4 billion increase,” Sir Keir told the Commons.
“That is the largest sustained increase in defence spending since the Cold War, which will put us in a position to ensure the security and defence of our country and of Europe.”