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,

Ukraine has used long-range drones to attack Russian oil platforms as it expands its strikes on the country's energy sector.

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 United States, Ukraine and major European countries have reached consensus on 90 percent of terms for a deal to end Ukraine’s war with Russia, two senior U.S. officials said Monday, but

Rustem Umierov, Secretary of Ukraine's National Security and Defence Council, has said he expects that Kyiv and Washington will have agreed on common positions by the end of the day, bringing peace closer.