Ukraine claimed it carried out an underwater drone strike on Dec. 15, the first such attack in maritime warfare, that critically damaged a Russian Kilo-class attack submarine at the Russian port of Novorossiysk,

Russian Deputy Foreign Minister Sergey Ryabkov told ABC News during an exclusive interview in Moscow on Monday that he believes the warring parties are close to a deal.

The U.S. has agreed to provide unspecified security guarantees to Ukraine as part of a peace deal to end Russia's nearly four-year war, and more talks are likely this weekend, U.S. officials said Monday following the latest discussions with Ukrainian President Volodymyr Zelenskyy in Berlin.

The latest overnight attacks come as US envoy Steve Witkoff prepares to hold more talks with Ukraine's president.

Germany is ramping up its military operations amid security concerns over the Russia-Ukraine war. German Defense Minister Boris Pistorious talked about the rearming on "60 Minutes." Isaac Stanley Becker,

For the second day running, President Volodymyr Zelensky of Ukraine was set to meet in Berlin with Steve Witkoff and Jared Kushner, two key Trump aides.

The European Union on Friday indefinitely froze Russia’s assets in Europe to ensure that Hungary and Slovakia, both with Moscow-friendly governments, can’t prevent the billions of euros from being used to support Ukraine.

The European Union's top diplomat, Kaja Kallas, said Russia does not need security guarantees because it is not under threat and that Ukraine's should include "real troops, real capabilities" to ensure Moscow does not invade again.