Russia's full-scale war on Ukraine has prompted a slew of difficult questions for a NATO alliance long confident of economic and military superiority over its historical eastern adversary.

Under the terms of the alliance, all Nato members are required to spend 2% of ... the 2% target are bordering Russia or ...

More than half the Arctic's coastline is Russian territory and in the last six years Moscow has built more than 475 military ...

The blue on the map shows NATO's core, which is structured around the organization's 28 member states. This number will soon expand to 29, as Montenegro is undergoing accessions talks.

US President-elect Donald Trump has called on Nato's European members to spend 5% of their national incomes on defence. That is more than double the military alliance's current target of 2%.

The alliance has stepped up intelligence, surveillance and reconnaissance activities around the Baltic Sea amid concerns of Russian gray zone warfare.

Nato secretary-general Mark Rutte has urged member countries to adopt a new "wartime mindset", and ramp up military spending. His comments echo previous demands made by incoming US President ...