LVIV, Ukraine (Reuters) -Ukrainian President Volodymyr Zelenskiy called on Monday for new international sanctions against Russia over its invasion of Ukraine, proposing a boycott of Russian oil and other Russian exports and a halt of exports to Russia. Western sanctions imposed over Russia’s military assault have already isolated Russia to a degree never before experienced by such a large economy. Zelenskiy said the economic pressure needed to be increased, calling in effect for an international trade embargo on Russia. [L2N2VA07O] “If the invasion continues and Russia has not abandoned its pl…