Project 667BDR Kalmar is a Russian submarine design project that focuses on developing a new class of nuclear-powered submarines. These submarines are intended to enhance the capabilities of the Russian Navy by providing advanced stealth and long-range strike options. The 667BDR Kalmar submarines are equipped with ballistic missiles, allowing them to serve as a crucial component of Russia's nuclear deterrent strategy. This project reflects the ongoing modernization efforts within the Russian military to maintain a competitive edge in underwater warfare.