ADVERTISEMENT The screws on Russia must be urgently tightened through fresh sanctions after the devastating attack against the Ukrainian city of Sumy, foreign ministers of the European Union said as they gathered for a meeting in Luxembourg on Monday. Two Russian ballistic missiles struck Sumy as the Christian faithful celebrated Palm Sunday, a festivity that honours Christ's entrance into Jerusalem. At least 34 people were killed and more than 110 were injured. "The strike hit the city centre