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.

The British defense chief is expected to urge Ukraine’s Western partners at the meeting to launch a “50-day drive” to get Kyiv the weapons it needs to fight Russia’s bigger army.

The Kremlin warned of escalating nuclear tensions and said Russia was taking action to protect its security in response. Dmitry Peskov, spokesman for Russian President Vladimir Putin, said there is "clearly no basis" for holding a summit of the "Nuclear Five" members of the UN Security Council—the U.S., Russia, China, the U.K., and France.

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

The US ambassador to NATO said China needed to be “called out for their subsidizing” of Russia’s war in Ukraine as the Trump administration ratchets up its threat to impose tariffs if Moscow does not agree to a peace deal.

Flight data showed how American and British reconnaissance aircraft flew from England toward Russia on Monday.

Leonid Slutsky, the head of the parliamentary Foreign Affairs Committee, threatened "corresponding retaliatory measures, including the use of nuclear weapons".

Former Russian President Medvedev calls for preemptive strikes while Trump gives Putin a 50-day ultimatum to reach peace with Ukraine or face sanctions.