Bulgaria has enough gas for 'three to four months'

Bulgaria can ensure natural gas supplies for at least three to four months if a price dispute between Moscow and Kiev leads to supply disruptions, the country's government said.

Bulgaria is one of the European Union countries most exposed to possible gas supply cuts, as it gets almost all of its gas from Russia's Gazprom via one route through Ukraine.

Around 15 percent of EU's gas is supplied through Ukraine.

Russia cut off gas to Ukraine on Monday in a dispute over unpaid bills that could disrupt supplies to the rest of Europe and set back hopes for peace in the former Soviet republic.

Read: Russia 'cuts off' Ukraine gas as payment deadline passes

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Ukraine's president extends truce for the east

Ukrainian President Petro Poroshenko has extended a week-long ceasefire with pro-Russian separatists in the east for another three days.