Russian President Vladimir Putin is stalling at the peace table while preparing a new military offensive in Ukraine, two senior U.S. senators warned Sunday, arguing that the next two weeks could shape the future of a war that has already smashed cities,

The surprise attack, which hit multiple locations deep within Russian territory, struck more than 40 military aircraft, including nuclear bombers.

Since last sitting down with Ukraine to talk peace, Russia has launched four of its five largest drone attacks against the country, killed more than 340 of its civilians and continued to peddle its false narrative about the unprovoked war it has been waging for more than a decade.

The proposed roadmap begins with a full ceasefire of at least 30 days, to be followed by the return of all prisoners held by each side, and of Ukrainian children taken into Russian-held territory, and...