150601-N-FQ994-291 BLACK SEA (June 1, 2015) Cmdr. Russell Caldwell, center left, executive officer of the guided-missile destroyer USS Ross (DDG 71), greets a senior officer from the Ukrainian navy Frigate Hetman Sahaydachniy (U 130). Ross is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe. (U.S. Navy photo by Mass Communication Specialist 3rd Class Robert S. Price/Released)