Shortly after Russian President Vladimir Putin authorised a "special military operation" in Ukraine, a series of explosions hit Ukraine's largest airport Boryspil and several military objects in eastern and southern regions of the country.
Ukraine acted after Russia issued a ban on civilian air traffic in airspace over eastern Ukraine.
Washington: U.S. defence officials said on Friday that Russian fighter jets flew into Ukrainian airspace a handful of times over the last 24 hours, in what one called a continued provocation of the heightened tensions
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