Analysis of information sources in references of the Wikipedia article "Russian submarine Belgorod (K-329)" in English language version.
... submarine was used for Poseidon trials, but it is planned to be deployed before the end of 2020 on the Project 09852 Belgorod submarine launched in spring 2019.87 The Belgorod is reportedly able to carry up to six Poseidon UUVs.
According to the CRS report, the Belgorod would be capable of carrying up to eight Poseidons, though some weapons experts say its payload is more likely to be six torpedoes.
