People on a pier look at the stern-part of the Russian tanker Volgoneft 139 at Russia's southern port of Kavkaz, November 16, 2007. A fuel oil spill from a tanker into the Black Sea is killing dolphins and the nearby Sea of Azov may suffer heavy pollution if urgent measures are not taken, Russia's environment watchdog said on Thursday. A storm on Sunday broke up the tanker and sank at least four freighters while crippling other vessels in the narrow Kerch Strait between the Black Sea and the Sea of Azov. Four seamen drowned and four others are missing. REUTERS/Alexander Natruskin (RUSSIA)