CNN  —  Volunteers helping to clean up the oil spill on Russia’s Black Sea coast are appealing to Russian President Vladimir Putin for more assistance, as they grapple with environmental havoc across more than 35 miles of coastline. Two Russian tankers carrying thousands of tons of fuel were badly damaged in stormy weather near the Black Sea earlier this month, leading to an oil spill, according to Russian state media. The tankers were carrying more than 9,000 tons of oil, according to TASS,