NATO leaders gathered in Spain on Wednesday to begin a summit amid the "most serious security crisis" the world has faced since World War II, Secretary-General Jens Stoltenberg said. Stoltenberg made the remarks in Madrid, where the heads of 30 NATO member states, including U.S. President Joe Biden, will decide on new membership in the alliance, Russia's war in Ukraine, and China's rising aggression. At the start of the summit ...