The Guardian – Captain Oleksandr put his hand on the throttle and nudged it forward. His patrol boat roared into action and zipped through the waves. Behind him was the Ukrainian port of Odesa. In front – beyond a grey expanse of water, and 180km (112 miles) away, was occupied Crimea. “We’re here to stop the Russians from taking the Black Sea,” Oleksandr said, as his boat – travelling at a nippy 30 knots – rolled up and down.