BRUSSELS (Reuters) - Moscow will curtail Ukraine's access to vital Russian markets if Kiev implements any part of a trade agreement with the European Union, President Vladimir Putin warned in a letter, toughening his stance on a deal at the centre of East-West tensions.
In a letter to Ukrainian President Petro Poroshenko, seen by Reuters on Tuesday, Putin warned that even changing national legislation to prepare for the EU-Ukraine trade deal, known as the association agreement, would trigger an immediate response from Moscow.