Swedish-Polish submarine forces. Let's solve the problem of the Baltic Sea erstwhile and for all

The creation of a joint Swedish-Polish (and possibly German) submarine forces would possibly solve the problem of the threat posed by the Russian Navy in the Baltic Sea during a possible armed conflict for a long time. Importantly, no 1 would gotta worry about the Kremlin's threats that the Baltic Fleet would be rapidly reinforced with fresh submarines with maneuvering missiles.