(ANSA-AFP) - KYIV, JAN 20 - Ukraine's President Volodymyr Zelensky said Thursday that there was no such thing as "minor incursions", after US President Joe Biden sparked controversy by suggesting a "minor" Russian attack could invite a lesser response. "We want to remind the great powers that there are no minor incursions and small nations. Just as there are no minor casualties and little grief from the loss of loved ones," Zelensky wrote on Twitter, with fears mounting of a major conflict in Europe with tens of thousands of Russian troops massed on Ukraine's border. (ANSA-AFP).