On June 23, 1983, the United States Navy was conducting operations that included the USS Midway carrier battle group and was traveling in the North Sea of Japan. This operation included roughly 30 ships and at 12:10 PM the Midway radioed that they were tracking five unknown objects in a V formation. The naval group location was 300 nautical miles southeast of the Russian Navy port of Vladivostok when things got interesting. The craft were traveling beyond Mach 5 and appeared to playing peekaboo with the radar operators. This is another fascinating story of an American military branch coming in contact with UFOs and you can find it HERE.