Ukraine accused Russia of blackmailing Europe over energy in an attempt to break its allies, as fighting heads into a third month without Russia capturing a major city WARSAW/SOFIA/KYIV — Russia halted gas supplies to Poland under the Yamal contract on Wednesday, data from the European Union network of gas transmission operators showed, in a deepening of the rift between the West and Russia over its invasion of Ukraine. Bulgaria, like Poland a NATO and EU member, said earlier that Russia would also halt supplies of gas to it. Ukraine accused Russia of blackmailing Europe over energy in an attempt...