Russia’s top security agency says that it has arrested several suspects accused of involvement in an alleged Ukrainian plot to assassinate senior military officers.

The current five-year gas transit deal between Russia and Ukraine expires in the end of the year. "There is no contract and it is impossible to conclude it in 3-4 days," Putin said in a televised briefing. Russian gas supplies to Europe via Ukraine are ...

Ukraine's military intelligence says North Korean troops are suffering heavy losses in Russia's Kursk region and face logistical difficulties as a result of Ukrainian attacks. The intelligence agency said Thursday that Ukrainian strikes near Novoivanovka inflicted heavy casualties on North Korean units.

Russia rebuffed incoming US President Donald Trump’s call for an immediate ceasefire in Ukraine, while saying it’s ready to hold negotiations on a long-lasting peace agreement to end almost three years of war.

Russia launches a Christmas Day missile attack on Ukraine as the war enters its third year. NBC News’ Erin McLaughlin reports on the shifting battleground there and in Washington, D.C.

Moscow again struck Ukraine’s energy infrastructure, part of an effort to wear down the country. “In the trenches, there are no holidays,” one man said.

Zelensky warns of greater military cooperation between Moscow and Pyongyang, including sending more troops and military equipment

Industry experts and Ukraine officials are suggesting that Russia likely is to blame for the Azerbaijan plane crash that killed dozens. NBC News' Daniele Hamamdjian reports on the ongoing investigation and what may have caused the crash.

DTEK, Ukraine’s largest private energy company, reported power outages across large areas of the country after Russia fired missiles against DTEK power stations in strikes on Christmas day. DTEK said

Ukrainians faced fresh Russian drone and missile strikes on energy infrastructure nationwide on Tuesday night into Christmas Day morning.

KYIV, Ukraine — North Korean troops are suffering heavy losses in the fighting in Russia’s Kursk region and are facing logistical difficulties as a result of Ukrainian attacks, Ukraine’s military intelligence said Thursday. The intelligence agency ...