2012年4月4日,印度海军正式列装了从俄罗斯租借来的“阿库拉”-Ⅱ级“环斑海豹”号攻击型核潜艇(在印度海军中的名字是“查克拉”号),该艇将部署在印度维沙卡帕特南基地。“查克拉”号的服役在南亚地区所引发的一系列变化,成为了国际社会的关注焦点。好事多磨的租借品“环斑海豹”号始建于1991年,2002年因资金缺乏而停工。2004年,印度在俄军武器库中选中了处于停建状态的“环斑海豹”号核潜艇。2004年1月,俄罗斯宣布俄罗斯联邦工业 On April 4, 2012, the Indian Navy formally installed “Akula” - Class II “Ringed Seal” attack nuclear submarines rented from Russia (in the Indian Navy, the name is “ Carat ”), the boat will be deployed in Visakhapatnam, India base. The series of changes triggered by the service of Chakla in South Asia have become the focus of attention of the international community. Good things and more grinding lease “Rings seal” was built in 1991, 2002 due to lack of funds and suspension of work. In 2004, India chose the “Ringed Seal” nuclear submarine in a suspended state in the Russian arsenal. January 2004, Russia announced the Russian Federation of industries