Russia launched its largest barrage of drones and missiles in a month across Ukraine, killing at least three people, Ukrainian President Volodymyr Zelensky said Saturday, as a Kyiv delegation heads to the United States for fresh peace talks.

In Russia, a major oil terminal near the port of Novorossiysk stopped operations Saturday after a strike by unmanned boats damaged one of its three mooring points, according to a statement from the Caspian Pipeline Consortium, which owns the terminal.

Ukraine says it used sea drones to strike two oil tankers that are part of Russia’s sanctioned shadow fleet and were a few dozen kilometres off the coast of Turkey.

The investigators are facing no obstacles,” Yermak wrote on Telegram, adding that he was fully cooperating with authorities.

President Volodymyr Zelenskiy's powerful chief of staff Andriy Yermak, a close ally who has headed Ukraine's negotiation team at fraught U.S.-backed peace talks, quit on Friday, hours after anti-corruption agents searched his home.

Ukrainian President Volodymyr Zelenskyy said on Friday that his chief of staff, Andriy Yermak, has submitted his resignation amid a corruption scandal. The departure comes at a perilous time for Kyiv as it faces U.

Russian President Vladimir Putin said that a US plan to end the war in Ukraine could “form the basis for future agreements” but renewed threats to seize more territory by force unless Kyiv withdraws.