The Biden administration plans to impose more sanctions on Russia over its war on Ukraine, taking aim at its oil revenues with action against tankers carrying Russian crude, three sources with knowledge of the matter said.

An animal rescue group said 61 dead cetaceans - an order of aquatic mammals that includes whales and dolphins - had been recorded since the oil spill.

A dolphin rescue center in Russia says 32 dolphins have died since fuel oil spilled out of two storm-stricken tankers three weeks ago in the Kerch Strait near the Russia-occupied Crimean Peninsula

In a heartbreaking scene, some 32 dolphins have washed up on a beach near Russia. The cause for this tragedy was down to a major oil spill with Russian President Vladimir Putin calling it an "ecological disaster".