The largest group of European nations not in NATO are those that profess their neutrality. Including nations such as Austria, Ireland, and Switzerland, some have military neutrality enshrined in their constitutions, or because of previous dealings with the great powers.

Ukraine is not a member of NATO, though the international security alliance has been a key player in its ongoing conflict with Russia, which escalated to a full-scale invasion by Russian forces Thursday. Since the United States helped form NATO, or the ...

NATO on Thursday said all its members were finally set this year to hit the alliance's previous defence spending target of two percent of GDP -- as they gear up for a far more ambitious goal. The 32-nation military alliance agreed at a June summit in the ...

Including the U.S., the alliance is expected to spend around US$1.6 trillion on defense in 2025, up from $1.45 trillion in 2024.