Diplomatic efforts have produced little progress in halting the fighting, including Monday's phone call between Trump and ...

NPR's Leila Fadel speaks with Fiona Hill, senior fellow with the Brookings Institution, about Russia's military buildup along its borders with NATO members.

Russia is rapidly building up its military presence along the border with Finland, a move Western analysts see as a long-term ...

Newly released satellite images show a Russian military buildup near a neighboring country's border, sparking fears of an assault on NATO.

Satellite imagery has revealed an increase in Russia's military activity near its border with Finland signaling its intention ...

NASA scientists rediscovered an abandoned U.S. nuclear base that lies entombed beneath at least 100 feet of ice.

Eastern Ukraine has been contested territory since 2014, when Russian-backed fighters seized large swathes of the eastern ...