By David Milliken LONDON, Jan 20 (Reuters) - The Bank of England must be "very alert" to geopolitical risks, Governor Andrew Bailey said on Tuesday as financial markets were thrown into fresh ​turmoil by U.S. President Donald Trump's stated desire to control Greenland and the risk of a ‌trade war. Wall Street futures hit one-month lows, while the dollar entered a second day of declines and long-dated government bond yields ‌rose sharply. Bailey, responding to lawmakers' questions, said geopolitical ris ...