Russian strategic bombers conducted a third circumnavigation of the U.S. Pacific island of Guam last week as other bombers flew close to Alaska and Europe, defense officials said. Two Tu-95 Bear H bombers made the flight around Guam, a key U.S. military hub in the western Pacific, on Dec. 13. No U.S. interceptor jets were dispatched to shadow the bombers. Separately, two Canadian F-18s intercepted two Bear bombers that intruded into the Alaska air defense identification zone on Dec. 8 that a military spokesman called “unwanted, provocative, and potentially destabilizing.” Around the same time in Europe, NATO jets intercepted Russian...