The Danish government has contacted EU and NATO over the drone attack, which happened at Aalborg airport - but have not yet confirmed whether Article 4 will be triggered

NATO allies are divided over whether the alliance should make it a policy to shoot down Russian jets that violate NATO’s airspace, with some countries including the US, Poland, and Baltic nations signaling that future violations should be met with force,

U.S. allies called an emergency meeting of the U.N. Security Council after a series of incidents raised alarm about growing Russian threats to Europe.

German defence contractor Rheinmetall said on Thursday it plans to sign a preliminary agreement in Hamburg later in the day to build a new ammunition factory in an as-yet unspecified NATO member state.

Secretary of State Marco Rubio reaffirmed the American commitment to NATO after incursions by Russian aircraft into the alliance’s airspace that have shaken governments on its eastern flank.

Estonia is building fortifications along its border with Russia and military officials warn NATO is facing growing threats from Moscow.

NATO warned Russia on Tuesday that it would use "all necessary military and non-military tools" to defend itself as it condemned Moscow for violating Estonian airspace in "a pattern of increasingly irresponsible behaviour".