 Complete the following phrase:  Niedersachsen participated in various international missions during her career. In October 1989 she and the destroyer Rommel and the supply ship Coburg visited Leningrad, the first German navy ships to visit a SovietRussian port for 77 years. Niedersachsen was frequently deployed to participate in NATO permanent monitoring missions in the Mediterranean and Atlantic, including Standing Naval Force Atlantic SNFL and Standing Naval Force Mediterranean SNFM in 1992. In 1995 Niedersachsen took part in the British-organised Joint Maritime Course, and was again part of Standing Naval Force Mediterranean in 1997. In March 1997 she was ordered into Albanian waters as part of Operation Libelle, the German-led evacuation of foreign nationals as the 