(Reuters) – Russian President Vladimir Putin urged his Ukrainian counterpart on Tuesday not to escalate an offensive against pro-Moscow rebels, and threatened economic retaliation for signing a trade accord with the European Union. At the leaders’ first meeting since June, Ukrainian President Petro Poroshenko replied by demanding a halt to arms shipments fromRussia to the separatist fighters. The pair shook hands at the start of talks in the Belarussian capital Minsk, only hours after Kiev said […]