Unexplained deaths of sea life are continuing to cause anxiety in Russia’s Far East. On Tuesday, fish, octopuses and crabs were filmed washed ashore hundreds of kilometers away from the spot where the alarm was first raised. A video of the ecological disaster near Ozernovskiy village on Kamchatka’s western coast shows dead marine creatures scattered along a 50-meter-wide area of the beach. The peninsula, some 7,000km east of Moscow, is home to one of the earth’s most pristine environments. The footage is similar to clips that came from Avacha Bay on the opposite eastern coast in late September, when numerous...