Greece and Cyprus accused rival Turkey on Thursday of stoking tensions as Ankara prepared to dispatch a drill ship to the Mediterranean next month in a search for natural gas. Relations between Athens and Ankara are strained over a raft of issues ranging from overflights to disputed waters. Cyprus, split along ethnic lines for nearly five decades, is a key point of division, deepened in recent years by overlapping and competing claims over offshore waters believed to contain large quantities of natural gas. Turkey is set to send a drill ship into the Mediterranean in early August in search of …