By Philip Pullella VATICAN CITY (Reuters) – Pope Francis, continuing his implicit criticism of Russia, called the conflict in Ukraine an unjustified “senseless massacre” and urged leaders to stop “this repugnant war”. “The violent aggression against Ukraine is unfortunately not slowing down,” he told about 30,000 people in St. Peter’s Square for his weekly Sunday address and blessing. “It is a senseless massacre where every day slaughters and atrocities are being repeated,” Francis said in his latest strong condemnation of the war, which has so far avoided mentioning Russia by name. “There is …