Senior U.S. Navy leaders in the Atlantic and European regions discussed, in some detail, the nature of the Russian build-up and naval activity in the Arctic region during a recent seminar in Washington. Speaking Feb. 9 at a seminar sponsored by the Wilson Center’s Polar Institute and the Center for Maritime Strategy (CMS), a think tank of the Navy League of the United States — Deterring Russia at Sea in the High North — were Adm. Daryl Caudle, commander, U.S. Fleet Forces Command and Vice Adm. Dan Dwyer, commander, U.S. Second Fleet. The seminar was moderated by retired Adm. James...