U.S. President Donald Trump last week called on European countries to stop importing Russian oil and gas and to start imposing tariffs on China in order to end the war in Ukraine. He added that Washington is ready to impose major sanctions on Russia if NATO members -- the vast majority of which are European -- did both. On the continued buying of Russian oil and gas, Trump highlighted to the members of the security organisation that it greatly weakens their negotiating position and bargaining power over Russia. On the issue of imposing tariffs…