The move sends a signal that the US is serious about cutting its NATO ally off from the advanced fighter jet over Turkey's planned purchase of Russia's S-400 missile system.

Poland's NATO accession in 1999 was meant to provide protection from Russia. Two decades on, a fear of its eastern neighbor remains a decisive factor in Polish politics, especially when it comes to bolstering US ties.

With NATO rattled amid pressure from Donald Trump, Defense Minister Ursula von der Leyen made an appeal for the alliance in a New York Times op-ed. She described NATO as an "emotional bond" between the US and Europe.

NATO and the United States have increased their pressure on Russia over its alleged violation of the INF treaty. What is known about the Russian missile at the center of the allegations?

The NATO summit in the shadow of American scoldings: US president Donald Trump demands higher defense expenditures, especially from Germany. But there is growing concern Trump could be making agreements with Vladimir Putin - at the expense of long-standing allies.

Angela Merkel: 'Germany also does a lot for NATO'

In an interview with FRANCE 24, NATO Secretary-General Jens Stoltenberg talked of the upcoming July NATO summit in Brussels, saying he believed it would be less divisive than the recent G7 summit in Canada.

German Chancellor Angela Merkel meets with President Trump on a one-day visit to Washington, with the two leaders far apart on issues like the Iran nuclear deal, NATO spending and trade.

Germany and Turkey's foreign ministers agree to pull out all the stops to improve ties that have soured due to disputes over Ankara's post-coup crackdown and the arrests of German citizens in Turkey.

Russia's navy continued their large-scale military drill with Belarus over the weekend just 30 kilometers away from its NATO neighbor.

Russian defence minister's plane buzzed by NATO jet.

U.S. President Donald Trump says "I'm committing the United States to Article 5," during a news conference at the White House, weeks after disappointing NATO allies for not mentioning his support.