Barroso said he had informed EU heads of state and government of difficulties developing for Ukraine to pay for Russian gas.
"It is in fact a major crisis," Barroso said. "We have sent a fact-finding mission to Kiev and Moscow. I have spoken to Prime Ministers [Vladimir] Putin and [Yulia] Timoshenko, to IMF general director [Dominque] Strauss-Kahn and gas industry representatives. There is indeed the risk of another major crisis in weeks, not months, and we must protect European citizens."
Barroso said that in the following week the Commission would host a meeting with representatives of international financial institutions, European gas companies and member countries to look into whether a short-term package of stop-gap funding could be put together.
He added that the Commission had already advised "vulnerable countries" to take immediate measures. During the January gas crisis, Bulgaria and Slovakia proved to be particularly vulnerable, lacking alternative supply sources or sufficient gas storage.
"We are working for the better, but we should also be ready for the worse," Barroso said.
Asked by EurActiv whether there was a risk that the EU would end up footing the bill over recurring gas disputes between Russia and Ukraine, the former Portuguese prime minister said that no operational financial decisions had been taken at this time.
"This is of course the responsibility of Russia and Ukraine," he said.



