The decision to purchase new weapons, particularly a missile defense system, will not be received warmly by Moscow.
The tests come as Russian President Vladimir Putin revealed new nuclear missiles and Moscow's relationship with the West took another major blow.
"We know that the Russians are involved," claimed Gen. John Nicholson.
Russia said the U.S. may risk "opening a Pandora's box" if it takes their military rivalry to outer space.
Joint statement from the U.S., U.K., France, and Germany decries the "assault on U.K. sovereignty".
Georgia is a small, mountainous country with around 4 million inhabitants that lies south of Russia bordering the Black Sea.
The annual event was reportedly almost three times the size it was last year.
NATO has around 32,000 troops in the Baltic region, compared with 78,000 Russians.
Russia said U.S. pilots should avoid traveling near Crimea—or expect Moscow's jets to fly close by.
Vladimir Putin has outlined the Arctic where Russia expects the U.S. and others to vie for "intimidating supremacy."
As a Turkey-backed offensive neared Manbij, Syria, the head of U.S. Central Command said withdrawal was "not something we are looking into."
The head of Russia's second biggest bank said the tightening of sanctions against the country's institutions would be "like declaring war."
General Sir Nick Carter warned the British government about further cuts to its armed forces.
Russia's manoeuvres in Ukraine have sparked concern in one of the few European countries not to join a U.S.-led military alliance.
A Navy spokesman told Newsweek the U.S. had successfully held the fort down, but its Romanian allies may be struggling against the livestock invasion.
Moscow has revamped virtually every aspect of its forces over the last decade and U.S. allies must modernize, Joe Dunford said.
There are no signs for optimism in U.S.-Russia ties, warned the head of Moscow's International Affairs Committee.
The Russian jets didn't broadcast the proper codes to air traffic control.
Turkey's relationship with the U.S. has been strained for months.
The S-400 deal, reportedly worth about $2.5 billion, has caused concern in the West because Turkey is a member of NATO.
The Kremlin has expressed concern over the missile shield the U.S. provides in Eastern Europe, near Russia's western border.