Ukrainian forces have begun attempts to retake some areas from Russia, which said this week it would scale back operations around Kyiv and the northern city of Chernihiv.
Meanwhile four million people have fled Ukraine, and a quarter of the country's population is thought to be displaced.
Two of the BBC's reporters on the ground answer your questions.
Orla Guerin is in Kyiv, Ukraine's capital
Jenny Hill is in the Russian capital, Moscow
In light of the recent counter-attacks that Ukraine has undertaken, and assuming that diplomatic talks between Ukraine and Russia fail, is it possible that Ukraine may be able to "win" this war militarily? - Harry Tinsley
