Denmark reported the latest in a series of drone sightings on Saturday, with the most recent incident occurring near military installations.

Estonia on Friday said it has requested consultations under Article 4 of the NATO treaty after Russian jets were intercepted over its airspace, in the third incident involving Russian aircraft on the Western military alliance's eastern flank in just over a week.

Russia’s activity inside NATO territory has moved from rare to routine. On September 10, two dozen Russian-made drones crossed into Polish airspace during a wider strike on Ukraine; NATO jets shot down those that posed a threat, and Poland activated Article 4 of the NATO Charter, which allows for consultations in the event of a threat.

Polish Prime Minister Donald Tusk said his country would formally request the invocation of NATO's Article 4 in response to the violation of his country's airspace by 19 Russian drones, some of which were shot down. NATO's Article 4 states: "The parties ...

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Two Spanish fighters in Lithuania were scrambled and continued to patrol the air, according to the Lithuanian Armed Forces

Three Russian military jets violated NATO member Estonia's airspace for 12 minutes in an "unprecedentedly brazen"incursion, the country's foreign ministry said Friday. Estonia is set to request

Denmark has weighed invoking NATO's Article 4 in response to numerous drone sightings this week throughout its country.

EXCLUSIVE: Recent Russian incursions into NATO airspace have sharpened divisions inside the alliance over how to respond, exposing both the strength and the limits of collective defense. Secretary General Mark Rutte clashed with Estonian Prime Minister ...