Russia has accused the U.K. of plotting a sabotage operation in a move that shows Moscow is setting the conditions for a conflict with NATO, according to the Institute for the Study of War (ISW).

A supply of U.S. Tomahawk cruise missiles to Ukraine would help "push Russia back," the foreign minister of NATO ally Estonia told ABC News.

Russian MP Alexey Zhuravlyov has said that Moscow would be ready for the missiles and could target Poland's Rzeszów military hub.

Russia’s aerial bombardment, particularly on sites close to NATO territory to the west of Ukraine, have frequently pushed the alliance to protect its airspace with fighter jets. Member nations are ...

Russian incursions into NATO airspace are fueling divisions among allies, with some warning that repeated Article 4 signals risk weakening deterrence without real action.

Intrusions into NATO’s airspace blamed on Russia have reached an unprecedented scale, raising questions about whether the Kremlin is trying to test the alliance’s willingness to respond to a direct ...

A rash of Russian violations of NATO airspace last month has prompted some allies to recall Turkey's swift and deadly response a decade ago, when it shot down a Russian fighter jet that had crossed ...

A new Danish intelligence assessment blames Russia for employing various 'gray zone' tactics against its forces.

BRUSSELS — NATO is stepping up aerial surveillance in the Baltic Sea, while France, Germany and Sweden are bolstering Denmark’s air defenses ahead of two summits in Copenhagen this week over a series ...

At NATO’s Geilenkirchen airbase in Germany, an E-3 Sentry plane takes off on a mission to scan the skies of Eastern Europe for signs of possible Russian encroachment into NATO airspace.

At UNGA, Lavrov warned NATO and the U.S. of a “decisive response," slams Iran sanctions and challenges Trump’s shift on Ukraine in a fiery address.