Trump called NATO "obsolete" before concluding it was "no longer obsolete" last month.
The saber-rattling president has a gift for raising tensions around the world.
Donald Trump's recent about-face on NATO didn't influence the long-planned delivery of the U.S.'s most advanced fighter jets.
U.S. paramedic Joseph Stone is the first casualty of an international monitoring mission in eastern Ukraine.
The alternative to the Pax Americana is massive political instability and human suffering.
The coalition known informally as the Muslim NATO is preparing to hold its first major meeting to define its structure and mission.
Russia blames a motley crew of phantom fascists, CIA agents and international villains.
Poland and the Baltic states of Estonia, Latvia and Lithuania were designated as venues for four major NATO battle groups.
Russia's condemnation follows President Donald Trump's statement that U.S.-Russia relations have hit a new low.
U.S. Strategic Command head Gen. John Hyten said the U.S. had "no defense" for Russia's SSC-8 nuclear-capable cruise missiles in Europe.
Despite holding opposing views on NATO and the Syrian war, Russia and Turkey held joint naval exercises in the Black Sea, where military drills have already heightened tensions.
Recent Russian deployments suggest a new intervention in Ukraine, Belarus or the Caucasus.
Russia's Yasen-class Kazan nuclear submarine was designed to hold long-range Kalibr cruise missiles, supersonic Oniks cruise missiles and more deadly weapons.
Lithuania, Latvia and Estonia, part of both NATO and the European Union, have been increasingly nervous since the Russian takeover of Crimea in 2014.
Putin fears that democracy in Ukraine will spread to Russia. And end his reign.
The used Adelaide frigates could cost Poland as much as $700 million.
Russia fired missiles only miles away from NATO forces in the volatile Black Sea region, where the U.S. has accused Moscow of threatening its interests.
Serbia's Defense Minister Zoran Djordjevic said Russia would provide his country with free jets, tanks and armored vehicles as Moscow seeks to increase its Balkans influence.
If the invasion of Crimea aimed to thwart NATO, it has backfired spectacularly.
NATO has planned to spend over $3.2 billion on a large boost to the 28-member military alliance's electronic and satellite communication defense systems.
Demonstrators in Bern held up a sign reading "Kill Erdogan with his own weapons."
Moscow's attempts to regain influence in the Balkans shows the perils of backing off Russia.
Russia has up to 5,000 military personnel operating inside the rebel Donbas.