Training Ukrainian servicemen to use Patriot missile defense systems is "another confirmation" of U.S. involvement in the war in Ukraine, the Russian ambassador to Washington, D.C. has said. Anatoly Antonov was reacting to the Pentagon's announcement on Tuesday that up to 100 Ukrainians would start training on the systems as early as next week at the U.S. Army base in Fort Sill, Oklahoma. The Patriots are among the most advanced defense systems in the U.S. arsenal and their supply to Ukraine was a key element of the $1.85 billion security assistance support package announced by the Department of Defense in...