Vladimir Putin has issued a severe warning to Denmark and the United States, cautioning that Russia will not remain passive ...

Russia's nuclear rules say it can use atomic weapons if the country — or one of its allies — is attacked, especially if the ...

General Christopher Donahue, commander of U.S. Army Europe and Africa, said allies could seize Kaliningrad "in a timeframe ...

The first explosions sounded in Ukraine’s cities before dawn Thursday as Russian President Vladimir Putin launched his long-anticipated military operation in Ukraine. Here’s what to know.

Sanctions target 105 additional so-called shadow fleet vessels, tighten restrictions on Russia's banking and finance sectors ...

Russia attacked cities across Ukraine, hitting energy infrastructure and wounding at least 15 people, authorities said.

Daniel Martindale helped the Kremlin target Ukrainian troops and was then spirited out of eastern Ukraine by Russian special ...

A Russian official says American Daniel Martindale has been rewarded with citizenship for spying on Ukraine, "by decree of ...

As Russian military forces and Russian-backed separatists continued striking targets across Ukraine on Thursday, Ukrainian President Volodymyr Zelenskyy called on the public to remain calm while ...