For better readability of the table, pass into the landscape mode.
Russia (aka the Russian Federation) is the largest country in the world. It shares land borders with loads of countries but, rather than list them all, why not just look at the map!
Russia has some 30+ PADI dive centres which are located primarily in the main towns, such as Moscow and St. Petersburg, which tend to train the local population. The diving on the Pacific coast takes place around Sakhalin Island, the Barents Sea at Murmansk and also, at some of the Black Sea resorts.
Sakhalin is a very long, but narrow island located between Japanese and Russian maritime territory. It is 1000km in length and is separated from the Asian continent by a narrow strait of 6 km in width. The diving is located off the south west corner at Moneron Island where the first Russian Marine reserve was created.
The main bodies of water around Russia are the Arctic Ocean, the Baltic, the North Pacific Ocean, the Sea of Japan, the Black Sea and the White Sea.
Probably the most popular form of diving in Russia is ice diving but, be prepared, it's expensive, but worth it. Not sure if it's for you? Then, take a look at this website where you can check out the experience. Probably one of the most spectacular sights below the ice is the Beluga whale
In addition to the diving (in northern parts of Russia), you will have the opportunity of seeing the Aurora Borealis (Northern Lights)