Ukrainian president calls for global response to Russian threat

Ukrainian President Petro Poroshenko gestures during a news conference after a meeting with U.S. Vice President Joe Biden in Kiev, Ukraine, January 16, 2017. REUTERS/Gleb Garanich

DAVOS, Switzerland (Reuters) - Ukrainian President Petro Poroshenko called for a worldwide effort to counter the threat of Russian cyber warfare and urged the United States to "be great again" by demonstrating leadership on issues such as global security.

U.S. President-elect Donald Trump's pledge to improve ties with the Kremlin and open admiration for Russian President Vladimir Putin has put Ukraine, whose Crimea region was annexed by Russia in 2014, under the spotlight.