Spain is not the only sceptic among NATO’s ranks. Slovakia, while less vocal, has also expressed ambiguity towards the 5% threshold. President Peter Pellegrini formally backed the target in The Hague, though just days before the NATO summit, Prime Minister Robert Fico declared that “neutrality would suit Slovakia”.

NATO's commitment to spend five percent 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.

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

NATO's enhanced ground capabilities in the Baltic region spark Russian warnings as military focus intensifies on Kaliningrad and the strategic Suwalki Corridor

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.

South Korea is in talks with NATO to launch a working-level defense consultative body as early as September, through which it would seek to expand opportunities

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.

In a statement, NATO said NATO Secretary General Mark Rutte will be in Washington on Monday and Tuesday and meet with President Trump and key administration officials.

"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,

NATO remains vigilant. The North Atlantic Alliance said that in connection with the Russian-Belarusian military exercises "Zapad-2025" planned for the fall, it remains vigilant and monitors Russia's military activity. A NATO spokesman said this in a commentary to Delfi.

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.