Kiev had threatened to take Russia to international arbitration if the gas had been cut off, and on Monday Oettinger said the talks agreed that this option would also not be taken up until both companies reported back.
Russian gas transiting through Ukraine covers about 15% of European needs, meaning any cut to supplies, as happened in 2006 and 2009, has a knock-on effect on the EU, several of whose member states are totally reliant on Russia for their energy.
The talks in Brussels took place just as there was an upsurge in violence in eastern Ukraine, where hundreds of pro-Russian gunmen struck a border guard camp in one of the biggest attacks of an insurgency that Washington says is directed by Moscow.
Copyright Agence France-Presse, 2014