In a letter addressed to top EU officials, Ukraine’s Prime Minister Arseniy Yatsenyuk complained about the Slovak gas system operator Eustream obstructing the increase of physical reverse flows to Ukraine by sticking to a contract the Slovak company has with Russia's Gazprom Export, a document seen by Europolitics has revealed.
The letter, dated June, is the latest step in a long-standing dispute between the two countries, with Ukrainian system operator Ukrtransgaz pushing Eustream to cancel the agreement it has with…