On April 6, 1993 submarine 664 received the honorific name Belgorod after the old Russian city with that name and the tactical designation K-139. In 1995, crew training began at the Obninsk-based 510th Naval Training Center "named after L. G. Osipenko" of the Russian Navy ("510-й учебный центр Военно-Морского Флота имени Л.Г. Осипенко"), but in 1997, construction was put on hold due to the severe economic crisis after the collapse of the Soviet Union (with the submarine three-quarters finished), mainly for financial reasons. On January 22, 1998, the crew was disbanded and the unfinished hull was mothballed. The loss of "Belgorod"'s sistership K-141 "Kursk" in 2000 led to the decision to resume construction of "Belgorod" to replace "Kursk," upgraded to Project 949AM specifications. By December 31, 2004 the hull was mostly complete, missing its powerplant, equipment and missile silos. The 100 million rubles provided by the Ministry of Defence were insufficient, and Sevmash was forced to invest its own financial resources to make up for the deficit. Sevmash, on its own initiative, continued construction at a slow pace.