One Russian banking source close to the Russian central bank said receiving revenue in a non-convertible currency with little value outside India was "pointless". They said, however, the problem remained of finding a viable alternative to the dollar, and that the problems affect buyers in Africa, China and Turkey which have become top buyers of Russian oil. The biggest issue, however, concerns India, which has been buying more than 60% of Russian seaborne oil, according to LSEG data and Reuters calculations. India's top refiner Indian Oil Corp (IOC.NS) is struggling to settle some payments, mainly for the purchase of Russia's light, sweet Sokol grade from the Sakhalin 1 project. From October, several UAE banks have tightened control over Russia-focused clients to ensure compliance with the price cap, according to five oil trading and bank sources.

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Persons: Yang Mei Hu, Tatiana Meel, Ivan Nosov, Sokol, YUAN, Barbara Lewis Organizations: COSCO Shipping, REUTERS, U.S ., UAE, Reuters, Indian Oil Corp, Sokol, IOC, UAE dirhams, Thomson Locations: Nakhodka, Russia, Ukraine Russian, MOSCOW, DELHI, Ukraine, India, Russian, Hong, Africa, China, Turkey, Washington, Moscow, United States, Russia's, Sakhalin, UAE