The Russian Navy just commissioned the Volkhov, their newest Kilo-class submarine. Here's What You Need to Remember: Though difficult to confirm, there are indications that the Russian Navy may eventually build and commission as many as five more 636.6 submarines, bringing the number of Russia’s most advanced submarines to twelve or thirteen. Russia’ black holes are ready to multiply it seems. The Russian Navy just commissioned the Volkhov, their newest Kilo-class submarine, Jane’s reported. Originally laid down in mid-2017, the submarine was built and commissioned in less than four years. And it may be one of the quietest submarines in the Russian Navy.