Moscow: Russia and Ukraine will resume efforts to resolve a gas pricing dispute after a Russian deadline for Kiev to pay some of its debts passed without Moscow cutting off supplies.

The gas dispute is at the heart of a crisis between Russia and Ukraine, and failing to resolve it would set back peace moves that are gaining momentum after weeks of violence in east Ukraine.

Russia had given Ukraine until 10am Moscow time (0600 GMT) to pay some of the billions of dollars it owes, but pulled back from the deadline after officials said talks brokered by the European Commission would continue in Brussels.

A spokesman for Gazprom said the talks would probably resume

at 1900 GMT. He declined to say what action Russia might take if Ukraine did not pay its bills.

A source in the Russian delegation, which left the previous/sound of talks in Brussels early in the morning with no agreement on gas prices, said the team would meet President Vladimir Putin later on Tuesday for consultations.

The Russian leader will have the final say on any deal.

After annexing Crimea in March after Ukraine’s Moscow-leaning president was overthrown, and facing unpredictable events in east Ukraine, Putin appears to have reason to reduce tension.

A spokeswoman for Ukraine’s Energy Ministry said its delegation was in Brussels and would remain there for now.

With Ukraine looking poised to pay more of its debt, talks have stalled on the price, threatening possible supply disruptions to the European Union, which gets about a third of its gas imports from Russia, almost half of it via Ukraine.

A source at Gazprom said Russia was supplying Ukraine with the usual volumes of gas and levels may have increased recently.

“Ukraine has been taking 112-115 million cubic metres a day, at a peak, as it pumps gas into storage facilities. Transit to Europe remains stable, at 200 million cubic metres per day,” the source said.

Talks between Russia, Ukraine and the European Commission have been going on while Kiev, Moscow and the Organization for Security and Cooperation in Europe discuss peace proposals put forward by Ukraine’s new president, Petro Poroshenko.

Those talks have produced what Kiev says is a mutual understanding on key aspects of the peace plan, intended to end an insurrection by separatist rebels who want to join parts of Russian-speaking east Ukraine with Russia.

Disagreement On Price Mechanism

The latest gas talks ended early on Tuesday without a deal on the price Moscow would charge Kiev in future.

Ukraine wants to change the 2009 contract that locked Kiev into buying a set volume of gas, whether it needs it or not, at $485 per 1,000 cubic metres — the highest price paid by any customer in Europe.

Moscow dropped the price to $268.50 after Ukraine’s then-President Viktor Yanukovich turned his back on a trade and association agreement with the European Union last year, but reinstated the original price after he was ousted in February.

Ukrainian Energy Minister Yuri Prodan said the negotiations had stumbled over a Russian price mechanism proposal, which would link lower prices to an export duty.

Russia has floated the idea of scrapping its export duty for gas exports to Ukraine — $100 per 1,000 cubic metres, introduced after Moscow annexed Crimea — to reduce the price for the neighbouring country.

Russian Energy Minister Alexander Novak said on Tuesday he had proposed “a very constructive plan, which we believe all stakeholders could and should accept”.

Moscow has said Ukraine must pay some of its debt before it can talk about price. Kiev paid off $786 million of its debts in late May and Russian officials have suggested it could pay off a $1.45 billion for November and December and a further $500 million as a part of a bill for April and May deliveries.

“The Russia-Ukraine gas tensions are not over yet, and will likely continue for a while, further threatening the stability and reliability of Russian gas transit to the EU via Ukraine,” analysts from Moscow-based Alfa bank said in a note.