Ukraine's military said Russia had pulled some troops from towns on the opposite bank of the Dnipro River from Kherson city, the first official Ukrainian report of a Russian withdrawal on what is now the main front line in the south.. * Spain has stepped up security at public and diplomatic buildings after a spate of letter bombs, including one sent to Prime Minister Pedro Sanchez and another to the Ukrainian embassy in Madrid, where an official suffered minor injuries. FIGHTING * Air raid alerts were issued across all of Ukraine following warnings by Ukrainian officials that Russia was preparing...