By Andrew Gray

LUXEMBOURG (Reuters) -EU foreign policy chief Josep Borrell expressed confidence on Monday that the bloc would finalise a plan within days to buy ammunition for Ukraine after Kyiv expressed frustration at wrangling among EU member states.

"Yes, still there is some disagreement. But I am sure everybody will understand that we are in a situation of extreme urgency," Borrell told reporters as he arrived for a meeting of EU foreign ministers in Luxembourg.

"I am sure that in the following days we will reach (an agreement)," he said.

    Ukrainian Foreign Minister Dmytro Kuleba expressed frustration in a tweet last week that the landmark deal sealed last month for EU countries to jointly buy artillery shells for Kyiv has not yet been implemented due to disagreements over how much of the business has to stay within Europe.

    "For Ukraine, the cost of inaction is measured in human lives," he warned on Thursday.

    Kuleba was expected to make his case directly to EU foreign ministers at Monday's meeting, addressing them by video link on the state of the war triggered by Russia's invasion last year.

Artillery rounds, particularly 155mm shells, have become critical to the conflict as Ukrainian and Russian forces wage an intense war of attrition. Officials say Kyiv is burning through more rounds than its allies can currently produce.

    The joint procurement plan is part of a multi-track EU deal to get 1 million artillery shells or missiles to Ukraine within 12 months and ramp up European munitions production, approved by foreign ministers last month.

The first element is the most immediate. It sets aside 1 billion euros ($1.1 billion) to reimburse EU governments for sending munitions to Ukraine from existing stocks.

Borrell stressed that track was up and running. He said EU countries had already requested reimbursements for ammunition worth 600 million euros ($660 million).

But the second track, worth another 1 billion euros to fund joint procurement, has yet to be finalised.

EU officials have said they hope to sign the first contracts with arms firms at the end of next month.

    EU countries agreed to buy the munitions from firms from the EU and from Norway, which has close economic ties to the bloc.

    But diplomats say France -- a champion of a stronger EU defence sector, with a substantial arms industry of its own -- has insisted production itself should take place in Europe.

    That stance has frustrated other EU members, including eastern and Baltic countries, Germany and the Netherlands. They have expressed scepticism that European industry has the capacity to produce enough shells quickly.

($1 = 0.9102 euros)