Russia’s Gazprom is revisiting the idea of building the second strand of the Yamal-Europe gas pipeline to boost volumes to Europe as it raises the stakes in a pricing dispute with Ukraine, the Interfax news agency reported on Wednesday. Alexei Miller, the head of Gazprom, told Russian President Vladimir Putin that the additional link could be launched in 2018-2019 and raise its capacity by 30%, or around 15 billion cubic meters a year, Interfax reported. Miller said the company had completed talks with Poland, Hungary and Slovakia about the possibility of increasing supplies via the so-called Yamal-Europe 2 pipeline. But Polish Treasury Minister Mikolaj Budzanowski voiced skepticism about the project. “I approach media speculation regarding the second Yamal gas strand with great caution, as agreeing or disagreeing to such a project should depend on the price of the transit gas and its suppliers,” Budzanowski said in a statement.