Under that deal RWE can supply up to 10bcm of gas a year. Russia has almost doubled the price of gas for Ukraine, following the toppling of pro-Russian President Viktor Yanukovich in February. Also, Ukraine owes Russian gas firm, Gazprom $2.2bn (£1.3bn) for supplies of gas. The two nations are in dispute over that debt and Ukrainian officials are concerned that Gazprom could just cut off the nation's supply of gas.
'Energy security'
Ukraine was hoping that Slovakia would be able to open more capacity, by reversing the direction of gas in the main pipeline from Russia to the West. But Slovakian authorities are concerned that would break the terms of its contract with Gazprom.
"I am convinced that this solution is the first possible and realistic one, and one which does not threaten the energy security of Slovakia and other EU countries," Slovak Economy Minister Tomas Malatinsky said in a statement, on Saturday.
The operators of Ukraine's and Slovakia's pipelines are due to sign the supply deal in Bratislava on Monday.
(bbc.com, April 27, 2014)