President Vladimir Putin said on Thursday that Russia agreed with U.S. proposals for a ceasefire in Ukraine but that any ceasefire would have to deal with the root causes of the conflict and that many details needed to be sorted out.

The Kremlin leader raises concerns over key issues, such as who would monitor the front and whether Kyiv would use the pause in hostilities to resupply its forces. ‘Hopefully they’ll do the right thing,

Ukraine’s consent to a 30-day ceasefire proposal has handed the Kremlin a difficult challenge at a time when its military has an upper hand in the war.