The Vepr SSN of project 971 began running trials after an upgrade and overhaul, a defense industry source told TASS. The handover deadline to the Navy is unknown so far and will depend on test results, as a lot of new systems have been installed during the upgrade. The main one is Kalibr missiles, the Army Standard writes.

The overhaul of the Tiger (K-154 Tigr) nuclear-powered attack submarine (SSN) of project 971 (Akula-class) is to be completed by the end of 2023. The SSN has not made any sorties since 2010s. Three years ago, it was towed to the shipyard in Snezhnogorsk. The overhaul will increase its might due to Kalibr missiles, the Izvestia daily writes.