EU gas prices have spiked to historic highs, increasing 10-fold on the Dutch TTF in the last 15 months,

said Serhiy Makogon, the Director General GTS Ukraine Operator, wrote yesterday on Facebook. “Today at the European hub TTF, the price of gas with delivery next month crossed the border of 40 euros per megawatt-hour,” he wrote. “This is a historic maximum. And this is 10 times more than in May last year.”

This summer’s high gas prices will mean increases of 15-70% in winter heating bills for Ukrainians

, forecasts Ukrteplokommunenergo, the heating supply industry association. “If the price of gas continues to rise…we can predict growth [of bills] by 15-70%, depending on the region, city, local community, said Sergiy Dunailo, the Vice President of the association. Ukraine imports from Europe about 30% of its gas, overwhelmingly of Russian origin.

With EU gas prices at 13-year highs and Russian gas supplies to the EU down by almost a fifth,

 the head of Ukraine’s pipeline company tells the Financial Times  that the EU should fight back against Russia’s ‘blackmail.” Sergiy Makogon, chief executive of Ukraine’s Gas Transmission System Operator, said he believed that Gazprom is deliberately holding back gas supplies from the EU to force approval of the controversial Russia-Germany Nord Stream 2 pipeline. “[The EU] should not follow this blackmail of Gazprom with prices,” he said.