Three British ex-special forces troops are feared to have been killed in the Russian attack on a base close to the Polish border, according to reports.
They are said to have died after Vladimir Putin’s forces launched a series of missile blasts on the Yavoriv site on Sunday, the Daily Mirror reports.
Sources told the newspaper that the strikes may have killed over 100 people. The Standard has approached the Foreign Office for comment.
A source said: “There were many more killed within the site than has been claimed and bodies are still being found.”
It comes as a fourth round of talks between Ukraine and Russia on Monday will focus on achieving a ceasefire, troop withdrawals and security guarantees for Ukraine, a Ukrainian negotiator said.
Mykhailo Podolyak said: "Negotiations. 4th round. On peace, ceasefire, immediate withdrawal of troops & security guarantees. Hard discussion," he wrote, adding that he believed Russia "still has a delusion that 19 days of violence against (Ukrainian) peaceful cities is the right strategy."
A Russian delegate, Leonid Slutsky, was quoted by the RIA news agency saying significant progress had been made and it was possible the delegations could soon reach draft agreements.