EU member states agreed Wednesday to extend damaging economic sanctions against Russia over the Ukraine crisis by another six months to the end of January 2016, officials said.

The agreement by ambassadors from the 28 European Union nations meeting in Brussels will be formalised by foreign ministers from the bloc when they meet next week, the officials said.

"EU foreign ministers will finalise the decision in Luxembourg on Monday," Poland's permanent representative to the EU said on Twitter, while several sources also confirmed the agreement.

The following day, the foreign ministers of France, Germany, Ukraine and Russia are slated to hold talks in Paris, it was announced Wednesday. It is hoped those meetings may create renewed diplomatic momentum towards resolving the violence in east Ukraine, and address tensions between Russian and Western nations over the conflict and sanctions that have arisen from it.

The EU imposed its sanctions targeting Russia's banks, oil and defence sectors after Malaysia Airlines flight MH17 was shot down over rebel-held eastern Ukraine in July 2014.

The United States has also imposed economic sanctions on Russia.

State Department spokesman John Kirby said Washington "welcomes the decision by the EU" to roll over its sanctions.

But he said he was not in a position "to make a judgement either for this country or others about whether and when additional sanctions will be applied" adding only that "Russia will continue to pay a cost for its violation of international law".

In March, EU leaders agreed in principle to roll the sanctions over by linking them directly to Russia's full implementation of a February ceasefire brokered by France and Germany in Minsk that runs to December this year.

"This is just putting into effect the March summit decision," one EU source told AFP.

"The idea is to extend them to end-January to give time to review progress on the Minsk accord before having to take a new decision."

With the legal text agreed by officials, foreign ministers will likely approve it Monday without discussion.

EU leaders meeting on Thursday and Friday in Brussels will then make the formal announcement, sources said.

- 'Nuclear sabre-rattling' -

The sanctions extension will keep relations between Russia and the West in the deep freeze, a year and a half after the crisis in Ukraine triggered the worst rift since the Cold War.

NATO chief Jens Stoltenberg on Tuesday accused Russia of "dangerous" nuclear sabre-rattling after President Vladimir Putin announced plans to deploy 40 new nuclear ballistic missiles.

Russia says the move is in response to the US-led NATO military alliance increasing its presence in east European states once ruled from Moscow.

Earlier this month the Group of Seven top industrialised nations -- which expelled Russia last year -- warned Moscow it would face increased sanctions for its "aggression" in Ukraine if Putin failed to mend his ways.

"We... stand ready to take further restrictive measures in order to increase the cost on Russia should its actions so require," G7 leaders said after a summit in Germany.

"We recall that the duration of sanctions should be clearly linked to Russia's complete implementation of the Minsk agreements and respect for Ukraine's sovereignty," they said.

The February Minsk accord was concluded after a September peace plan failed to halt the fighting, with French President Francois Hollande and German Chancellor Angela Merkel driving the talks as pro-Russian rebels pushed back government forces.

The ceasefire has largely held but Kiev and the rebels swap charges daily over breaches, and observers have reported a sharp pick up in fighting in recent weeks.

The EU first imposed asset freezes and travel bans on leading rebel and Russian figures after Moscow's annexation of Crimea in March 2014, and has expanded the sanctions as the conflict spread into eastern Ukraine, claiming more than 6,400 lives.

The decision to impose full-blown economic sector sanctions was much more controversial and painful, with certain member states such as Italy and Germany having particularly important trade and political ties with Moscow.

The shooting down of flight MH17, however, made those bilateral considerations secondary to ensuring a strong collective reaction.
Source: AFP