An unidentified drone suspected to have come from Belarus entered into Lithuanian airspace on Monday, according a local outlet. Darius Buta, a representative of Lithuania's National Crisis Management Center, told public broadcaster LRT that a drone was spotted at an altitude of approximately 650 feet near the capital city of Vilnius.

Business Insider flew aboard the decades-old aircraft during a recent surveillance mission. NATO plans to replace the E-3 in the coming years.

NATO's commitment to spend 5% of GDP on defense by 2035 was meant to unify the alliance, but it's revealing dangerous fault lines between members who face Russia's threat and those who don't.

Russian President Vladimir Putin's war in Ukraine and President Trump's tough stance on NATO have 'energized' the alliance into action, experts explain unique circumstances that led to unprecedented commitments.

Business Insider got access to a NATO AWACS flight for an eight-hour surveillance mission over Eastern Europe.

A Norwegian P-8A "Poseidon" flew close to Russia's major submarine hubs in the Murmansk region before heading to the Norwegian archipelago of Svalbard.

"I am very open to having a public debate about the future of Austria's security and defense policy," Austria's Foreign Minister Beate Meinl-Reisinger said. "Although there are currently no majorities in parliament and in the population for joining NATO,

Austria must be ready to engage in discussions about potentially joining NATO, Foreign Minister Beate Meinl-Reisinger emphasized, while recognizing t

As expected, the main result was the European pledge to spend 3.5 per cent on defence and 1.5 per cent on defence-relevant infrastructure by 2035, bringing the total spending by European countries to 5 per cent of GDP — the number Donald Trump had demanded some months earlier. The spending pledge seems to have pacified the US president for now.

A massive Russian drone and missile attack on Ukraine over the weekend prompted a direct military response from NATO. Polish and other allied jets were scrambled as a precaution during the hours-long barrage.