The article, as the cornerstone of a treaty signed in 1949, establishes solidarity among member states and has been invoked only once. Article 5 is the cornerstone of the North Atlantic Treaty Organization (NATO) and states that an attack on one member of NATO is an attack on all of …

Defense Secretary Lloyd Austin will leave for a trip to Europe on Tuesday to speak with defense officials in Belgium, Poland and Lithuania as the potential of a Russian invasion of Ukraine continues to increase, chief Pentagon spokesman John Kirby said. In Belgium, Austin will meet with NATO leaders and …

The Islamic State group is a growing threat in northeastern Syria despite the killing of its leader in a U.S. commando operation last week, says the chief commander of the U.S.-allied Syrian Kurdish-led force. Mazloum Abdi, who heads the U.S.-backed Syrian Democratic Forces, warned that IS fighters are still very …