The 91RE1 Club-N is a submarine-based ballistic missile designed to engage submarines using its warhead which includes a small-size MPT-1UME torpedo fitted with an active homing head. It is suitable for engagements of hostile submarines located at 50 km. It utilizes an Inertial Navigation System (INS) based guidance system to reach the target area. The 91RE1 and 91RTE2 ballistic missiles differ in size and booster design. They are expected to replace the SS-N-15 and SS-N-16 missiles in the Russian Navy.