A Norwegian nuclear safety expert says the fact that barium, strontium, and lanthanum isotopes were released at a northern Russian military base indicates a nuclear reactor exploded, not a fuel source for a rocket engine or a missile, as Moscow has claimed.
RFE/RL: Norwegian expert says explosion at Russian military base is likely nuclear reactor
This archive photo shows Russian nuclear submarine, the Yuri Dolgoruky, driving in the water area of the Sevmash factory in the northern city of Arkhangelsk on July 2, 2009.
