The latest Russian Navy submarine to be commissioned, B-274 Petropavlovsk-Kamchatsky, in St. Petersburg, November 25 2019. Unlike U.S. Navy submarines she is conventionally powered. Russian Ministry of Defense
Forbes: The Latest Russian Submarine Is Unlike Any In U.S. Navy Service
There is an aspect of submarine operations where the Russian and U.S. Navies take fundamentally different stances. The latest Russian submarine to enter service, B-274 Petropavlovsk-Kamchatsky, illustrates this. She is unlike anything in U.S. Navy service because she is conventionally powered, meaning that she does not have a nuclear reactor. For comparison the last time the U.S. Navy commissioned a non-nuclear submarine was in the 1950s.
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WNU Editor: Cheaper to build and maintain. That is why Russia is building them.