Amid an atmosphere of tension and challenges, NATO leaders convened in Ankara for a summit of major significance, at which they reaffirmed an unwavering commitment to the collective defence clause, announced more than $50 billion in defence investments, and pledged €140 billion in aid to Ukraine.

Divisions between US President Donald Trump and his counterparts were on display as Trump made clear his displeasure with the alliance over its refusal to support his bid to take control of Greenland.

NATO member states, including the United States, reaffirmed their firm commitment to the collective defence clause enshrined in Article 5 of the alliance's treaty, according to the text of the Ankara summit declaration.

The declaration, issued on the second and final day of the summit, states that an attack on any ally is an attack on all allies. It adds: