By Polina Devitt, Natalia Zinets and Polina Nikolskaya MOSCOW/KYIV/DONETSK, Ukraine (Reuters) -Russia will extend military drills in Belarus that were due to end on Sunday, the Belarusian defence ministry announced, adding to mounting tensions as satellite images appeared to show new deployments of Russian armor and troops close to Ukraine. The White House said President Joe Biden was canceling a trip to Delaware and remaining in Washington following a two-hour meeting of his National Security Council. Biden instead spoke by phone with French President Emmanuel Macron about the Russian buildup…