When Donald Trump suggested during the 2016 presidential campaign that he might not honor a U.S. commitment to defend other NATO countries if they were attacked, it triggered alarm throughout the trans-Atlantic alliance.

President Joe Biden and his Western counterparts are meeting in Washington this week to mark the 75th anniversary of NATO.

Argentina has requested to join NATO as a global partner, a status that would clear the way for greater political and security cooperation at a time when the right-wing government of President Javier Milei aims to boost ties with Western powers and attract investment.

Donald Trump says he once warned that he would allow Russia to do whatever it wants to NATO member nations that are “delinquent” in devoting 2% of their gross domestic product to defense.

Ukraine may have gotten support and vague assurances from NATO leaders in Vilnius this week, but ultimately it received no clear commitment that it will be joining the club any time soon.

President Joe Biden calls Finland and Sweden “our allies of the high north.”.

President Joe Biden formally welcomed Finland and Sweden joining the NATO alliance Tuesday as he signed the instruments of ratification that delivered the U.S.’s formal backing of the Nordic nations entering the mutual defense pact.

Senate Republican leader Mitch McConnell played a pivotal role in the Senate ratifying NATO membership for Sweden and Finland.

U.S. Senators delivered an overwhelming bipartisan vote ratifying NATO membership for Finland and Sweden.

Turkish President Recep Tayyip Erdogan says his country can still “freeze” Sweden and Finland’s membership in NATO unless the two countries take steps that meet Ankara’s security demands.

Bulgaria’s president has launched talks with all political parties represented in parliament to see if there's still a chance to form a government and avoid another early election.

Spain is increasing military spending as it works toward meeting a NATO commitment by dedicating 2% of gross domestic product to defense.

Greece's prime minister says his country has sent a letter of request to the United States to buy a squadron of F-35 fighter jets.

Just two days after agreeing to lift deal-breaking objections to Sweden and Finland’s NATO accession, Turkey’s leader has threatened that Ankara could still block the process if the two countries fail to fully meet his expectations.

The dissonant realities of President Joe Biden’s second year in office were on display Thursday as he wound up a five-day trip to Europe that highlighted both the key U.S. role in mounting a strong allied response to Vladimir Putin’s aggression and the domestic turmoil that is dragging Biden down at home.

The head of NATO says an unstable world could get even more dangerous if the alliance does not remain strong and united.

Canadian Prime Minister Justin Trudeau says Canada will increase its troop presence in Latvia as part of NATO’s commitment to strengthen its deterrence measures along Russia’s border.

President Joe Biden says the U.S. is enhancing its military presence in Europe for the long haul to bolster regional security after Russia’s invasion of Ukraine.

NATO has declared Russia the “most significant and direct threat” to its members’ peace and security.

President Joe Biden is opening his three-day visit to a NATO summit by pledging to beef up the American military presence in Europe.

Turkey has agreed to lift its opposition to Sweden and Finland joining NATO, a breakthrough in an impasse clouding a leaders’ summit in Madrid amid Europe’s worst security crisis in decades triggered by the war in Ukraine.

Swedish Prime Minister Magdalena Andersson says Tuesday’s deal with Turkey on her country’s and Finland’s membership of NATO will bring “more security” to the alliance.

The North Atlantic Treaty Organization is meeting in Madrid this week with an urgent need to reassert its original mission: preventing Russian aggression against Western democracies.

Ukrainian President Volodymyr Zelenskyy has thanked the United States for the $40 billion aid package, which got final congressional approval.

Russia’s attack on Ukraine's Zaporizhzhia nuclear power plant has renewed calls for NATO to impose a no-fly zone over Ukraine, That's despite the repeated rejection of the idea by Western leaders, who are concerned about triggering a wider war in Europe.

Many European Union nations are wary about spending big on their militaries.

As tensions build with Russia, NATO is focused on defending its 30 member countries.

A Michigan native was sworn in as the U.S. Permanent Representative to NATO this month.

Joe Biden has used his first appearance at the NATO summit as president to call on Russian President Vladimir Putin to step back from provocative actions targeting the U.S. and allies.