Ukraine's President Volodymyr Zelensky has accused Vladimir Putin of trying to "sabotage" diplomatic efforts to secure an immediate ceasefire. In a post on social media, he urged the US to put more pressure on the Russian president,

Russia struck a sedate tone on Friday but acknowledged grounds for cautious optimism, after only backing the "idea" of a U.S. brokered 30-day ceasefire with firm caveats.

Russia's Vladimir Putin said he agrees in principle with a U.S. proposal for a 30-day ceasefire in Ukraine, but that the terms need to be worked out.