Ukraine's president Volodymyr Zelensky has called on Vladimir Putin to hold face-to-face talks despite UK fears Moscow will use negotiations as a "smokescreen" to prepare for an even more brutal assault.
Mr Zelensky used a video message to tell the Russian president "it's time to meet, time to talk" but, in the UK, Cabinet ministers urged caution about talks with the Putin regime.
Foreign Secretary Liz Truss said it was up to Mr Zelensky how his country approached peace talks but she was "very sceptical" about the Kremlin's position.
Watch: The missile systems being used to fend off Russia's invasion.
She told The Times: "If a country is serious about negotiations, it doesn't indiscriminately bomb civilians that day."
Ms Truss said talks could be a "smokescreen" and "what we've seen is an attempt to create space for the Russians to regroup".
Tory party chairman Oliver Dowden told Times Radio: "We, of course, have to treat the Russians with a high degree of scepticism given that they were the ones that commenced this war."
He said the UK had to have a "hard-headed sceptical approach" but "if we can find a way through to a peaceful and negotiated settlement we should, of course, try to achieve that".
British defence intelligence specialists believe Russia will wage a war of attrition, having failed in its goal of rapidly conquering its neighbour.
"This is likely to involve the indiscriminate use of firepower resulting in increased civilian casualties, destruction of Ukrainian infrastructure, and intensify the humanitarian crisis," the Ministry of Defence (MOD) said.