A convoy of 280 trucks near Moscow left for Ukraine on an international humanitarian relief mission on Tuesday morning. Ukrainian and Western leaders have expressed concerns that Russia could use an aid mission as cover for sending troops into rebel-held territory. (Photo: AP) MOSCOW—Russia sent a convoy of 280 trucks carrying what it said was humanitarian aid for war-torn cities in eastern Ukraine on Tuesday, setting off diplomatic tension over efforts to ease civilian suffering there. Ukrainian officials said that they had been notified by Moscow of the column and that it was expected to cross the border at a post near Kharkiv, under the control of Ukrainian authorities and the International Red Cross. But Kiev said the cargo would have to be transferred from the Russian trucks to Red Cross vehicles at the border, warning that any unilateral attempt to deliver aid would be viewed as an act […]