By Marek Strzelecki, Tsvetelia Tsolova and Pavel Polityuk WARSAW/SOFIA/KYIV (Reuters) – Russia will on Wednesday stop supplying gas to Poland and Bulgaria, the two NATO and EU members said, an escalation in the deepening rift between the West and Moscow over Ukraine as tensions also surged in neighbouring Moldova. Kyiv accused Moscow of blackmailing Europe and of trying to drag Moldova into the conflict after authorities in the Moscow-backed region of Transdniestria said they had been targeted by a series of attacks. Staunch Kremlin opponent Poland is among the European countries seeking the t…