Russian jets violated NATO airspace over Lithuania for 18 seconds during suspected refueling exercise. Nation's president calls it a breach of international law amid tensions.

The European Union has imposed more economic sanctions on Russia. The new penalties announced on Thursday add to measures by U.S.

President Vladimir Putin said on Thursday that Russia would never bow to pressure from the United States or any other country, and cautioned that the response to any strikes deep into Russia would be very serious and overwhelming.

Russia launched a large-scale air attack on Ukraine early Wednesday, causing power outages across most of the country, setting homes ablaze and killing at least six people, including a six-month-old baby,

Russian President Vladimir Putin has directed drills of the country’s strategic nuclear forces that featured practice missile launches

The Polish foreign minister said he could not guarantee that Russian President Vladimir Putin's plane would not be forced to land.

It was, perhaps, the costliest phone call in history. When Sergei Lavrov, the Russian foreign minister, told his American counterpart on Monday that the Kremlin had not budged from its demand for an even bigger slice of Ukraine than its forces currently hold,

President Trump said last week that he and Russian President Vladimir Putin would meet in Budapest, Hungary, though he did not say when.