The latest U.S. push to end Russia’s nearly 4-year-old war in Ukraine has unleashed a frenzy of diplomatic activity.

European leaders have reportedly expressed fears about the Trump administration using peace negotiations to “betray” Ukraine as the country seeks to end its nearly four-year war with Russia.

US special envoy Steve Witkoff will meet senior Ukrainian negotiator, Rustem Umerov, for talks in Miami on Thursday.

The presidents of Ukraine and Russia are expected to be briefed this week on outcomes of Sunday's U.S.-Ukraine talks.

The French President and German Chancellor have voiced scepticism over the direction that U.S. efforts to negotiate a peace between Ukraine and Russia are taking, German magazine Spiegel cited a transcript of a confidential call as showing.

Russia launched a massive missile and drone attack on Ukraine overnight, targeting energy infrastructure. Ukrainian forces shot down 585 drones and 30 missiles.