Trump cancelled a press conference and left the meeting earlier amid a spat with Justine Trudeau, but Jens Stoltenberg said unity within the alliance was "iron-clad."
Turkey's invasion of northeastern Syria has prompted protests from other NATO nations and opened up cracks in the alliance.
Iran is widely expected to make extensive use of its special operation forces and regional proxy militias in a hypothetical future war with the U.S.
"These are relationships that we've developed over the course of seven decades," Guy Snodgrass said, "over a very short amount of time, we've put those at risk."
New Jersey Democratic Senator Bob Menendez said it's no coincidence that Russia continues getting foreign policy victories over the Trump administration.
Turkey is facing widespread condemnation for its military operation against Kurdish-led forces in northeastern Syria.
Donald Trump admitted in 2015 that the towers represent a conflict of interest in his dealings with Turkey.
Foreign Ministry spokesperson Maria Zakharova said the efforts of the western Allies "should of course not be exaggerated."
A Fox News panel expressed fears President Donald Trump may inflame "leave" Brexit and anti-NATO sentiment during his U.K. visit.
President Donald Trump's administration has created a potent anti-Iranian alliance in the Middle East.
Not everyone was so sure that the supposed threat from Iran warrants America's military response.
Israeli Prime Minister Benjamin Netanyahu said "there is no limitation to our freedom of action, and we appreciate very much the fact that the United States backs up our actions."
The Syrian rebels once backed by the U.S. under former President Barack Obama now pose the greatest threat to Kurdish allies opposed by Turkey.
Trump reportedly calls people "Bushies" and it's not meant to be a compliment.
Trump's "going to look like a loser" if he doesn't get his long-promised wall and there's no shutdown, one Fox News host said.
Even some of Donald Trump's most loyal supporters are beginning to wonder what, exactly, is going on in the White House amid the Mueller investigation.
The Canadian Armed Forces have assured the U.S., Britain, Australia and New Zealand that legal weed use won't impact troop performance during joint operations.
Two former State Department officials who helped craft the 2015 Iran nuclear deal say allies are increasingly frustrated with U.S. financial dominance—and this may be the final straw.
Secretary James Mattis is pushing for NATO to establish 30 land battalions, 30 air fighter squadrons, and 30 navy ships, including destroyers, to be ready to launch a fight against Russia.
Kim Jong Un complimented Russia but scowled for the cameras in a historic summit with Moscow's top diplomats. On Russian television, his expression mysteriously changed.
The remains of the AE1, which vanished in 1914 with 35 crew on board, have been located near Papa New Guinea.
Veterans are more likely to be jobless and they have suicide rates higher than the national average.
Take the former Glenview Naval Air Station, near Chicago, for example.
Soviet victory did not require help from Allies, the majority of Russians believe.
Turkey and India's leaders pledged tightening economic and counterterrorism ties.