KYIV, Sept 21 (Reuters) - Ukraine's SBU security service and navy struck the Saky air base in Russian-occupied Crimea overnight, inflicting "serious damage", a Ukrainian intelligence source said on Thursday. The Russian military, meanwhile, said it had destroyed 19 Ukrainian drones over Crimea and the Black Sea, and gave no details on casualties or damage. Ukraine has ramped up attacks in the Black Sea and Crimea, which was seized and annexed by Russia in 2014, as Ukrainian forces press on with a nearly four-month-old counteroffensive. Kyiv said a series of attacks on Crimea last week damaged two Russian patrol ships and destroyed a sophisticated air defence system. On Wednesday Kyiv said Ukrainian forces struck a Russian Black Sea fleet command post near Sevastopol in Crimea.

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Persons: Tom Balmforth, Anna Pruchnicka, Mark Heinrich, Timothy Organizations: Security Service, Navy, Wednesday Kyiv, Timothy Heritage, Thomson Locations: Crimea, Ukrainian, Ukraine, Russia, Kyiv, Russian, Sevastopol