Russia is stepping up covert attacks across Europe — rail sabotage, drones, cyberstrikes — testing NATO. Polish officials warn "disposable agents" are sowing fear and weakening support for Ukraine.

NATO Secretary-General Mark Rutte insisted Monday that Europe is incapable of defending itself without U.S. military support and would have to more than double current military spending targets to be able to do so.

It was a volatile week for trans-Atlantic relations, marked by President Trump statements that unsettled global markets and strained ties with U.S. allies — on topics ranging from Greenland to Gaza.

Commissioned by NPR in partnership with Ipsos, the poll also highlights sharp partisan divides on key foreign policy issues.

Her comments came in response to U.S. President Donald Trump's renewed call for the strategic, mineral-rich Arctic island to come under U.S. control in the aftermath of the weekend military operation in Venezuela.

Many Danes are rethinking their personal security, and stocking up on emergency supplies, amid unidentified drone appearances. Denmark's leaders warn that Russia is waging a "hybrid war."

Trump tells NATO members they need to cut off Russia energy purchases before he will take bigger steps to isolate Russia over its war in Ukraine.

President Trump threatened to punish Russia with heavy tariffs on countries that trade with Moscow if the Kremlin fails to reach a ceasefire deal with Ukraine, while promising Kyiv weapons.

NATO's summit in the Netherlands on Wednesday has been described as "transformational" and "historic."

President Trump spoke at the conclusion of the summit in the Netherlands — as the world watches to see whether a ceasefire between Israel and Iran will endure.

NATO is clarifying comments that Secretary-General Mark Rutte made when he suggested that four U.S. soldiers who went missing while training in Lithuania had died, even though the U.S. Army said their fate was not yet confirmed.

The F-35 was meant as a one-size-fits-all fighter that could be used across NATO. But strained U.S.-Europe relations are giving some member countries second thoughts about the U.S.-built plane.

European Commission President Ursula von der Leyen proposed an $840 billion plan to build up the bloc's defense, as President Trump pauses military aid to Ukraine.

As the Trump administration ramps up its rhetoric against Ukraine and NATO, European countries are taking note — with increasing alarm.

Several NATO allies stressed that Ukraine and Europe must not be cut out of any peace talks, as Defense Secretary Pete Hegseth denied that the U.S. is betraying Ukraine.