By signaling its openness to a ceasefire, Ukraine has handed the Kremlin a difficult challenge at a time when the Russian military has the upper hand in the war: Should Moscow accept a truce and abandon hopes of making new gains,

President Vladimir Putin is no doubt thinking carefully about whether to accept the ceasefire proposal, reject it, or demand amendments to it. The idea of turning down - or amending - the ceasefire proposal seems to be gaining most traction among commentators.