NATO's strategy is sound but its allies lack the arsenals and manufacturing needed to carry it out in a long war, a new report found.

Ukraine's membership of NATO is "achievable", but Kyiv will have to fight to persuade allies to make it happen, President Volodymyr Zelenskiy told Ukrainian diplomats in a speech on Sunday. Ukraine has repeatedly urged NATO to invite Kyiv to become a member.

Ukraine stepped up its efforts to join NATO after Russia invaded last year, arguing that the security assurances given by Moscow, Washington and London when it relinquished its nuclear arsenal to Russia in 1994 were clearly worthless.

NATO’s secretary-general says he wants to discuss ways to put Ukraine in a position of strength for any future peace talks with Russia during a meeting Wednesday with Ukraine’s president and a small number of European leaders.

Tensions along NATO's eastern flank are high because of the risks posed by Russian military actions near the borders of alliance member states.

Slovak President Peter Pellegrini discussed peace negotiations between Russia and Ukraine in an interview on Sunday.

The Ukraine war is a wake-up call for NATO to stockpile more ammunition. NATO states need more ammo and defense production to replace losses in a long war. Powers like Russia and China have ...

The Ukraine war shows that the theory behind NATO's combat doctrine is sound. The problem is that Britain and many other NATO allies lack the resources to implement it, a new report argues.

A template for ending the armed hostilities between Russia and Ukraine is finally on the table. The devil will be in the details.

The debate over a possible ceasefire in Ukraine has shifted from territorial defense to securing guarantees for Kyiv. A new formula that involves NATO might be the most realistic hope now that Trump is arriving at the White House.

NATO is in a "boiling frog" situation with suspected Russian hybrid attacks creeping up to a volume that would have been "utterly unacceptable" five years ago, says the alliance's deputy assistant secretary general.