Russia is developing two new types of nuclear submarines to replace its Project 949A Oscar-class and Project 945 Sierra-class vessels. The new vessels are a generation beyond Russia’s Project 955 Borei-class ballistic missile submarine and Project 855M Yasen-class guided-missile submarines, which are originally late Soviet-era designs.
The Sierra-class replacement is being designed as an “interceptor” that would protect the Russian nuclear ballistic missile submarine fleet while the Oscar-class replacement would be a guided-missile submarine (SSGN) that would hunt U.S. carrier strike groups like their forbearers.
Read more at The National Interest