The move follows Ukraine's ratification of the minerals agreement, deepening U.S.-Ukraine economic ties and signaling expanded U.S. involvement in Ukraine's long-term recovery.

"Ukraine has initiated a coordinated campaign to vilify Hungary in order to undermine our initiative to hold a poll on (Kyiv's) EU membership," Hungarian Prime Minister Viktor Orban said.

"Our people are going to be going there," U.S. President Donald Trump said.

German Chancellor Friedrich Merz warned that further concessions from Ukraine during negotiations would be unreasonable if Russia continues to attack civilian targets.

U.S. President Donald Trump's special envoys, Steve Witkoff and Keith Kellogg, will travel to Istanbul for possible peace talks between Ukraine and Russia, Reuters reported on May 13, citing three undisclosed sources.

President Volodymyr Zelensky said he will meet with Turkish President Recep Tayyip Erdogan in Ankara, but said both leaders are ready to fly to Istanbul if Russian President Vladimir Putin chooses to attend the talks there.

Dnipropetrovsk Oblast, a major industrial and logistical hub, remains untouched by ground incursions but is under growing threat.

Presidential Office chief Andriy Yermak said Ukraine is "ready to discuss anything," but "only if a ceasefire is achieved."

A captive named Umit allegedly agreed to serve in the Russian army in exchange for Russian citizenship and a monetary reward of 2 million rubles ($25,000).

Russia's Buryatia Republic declared a state of emergency on May 13 over massive forest fires that have engulfed multiple regions in the Russian Far East.