European Union countries are on the verge of agreeing to start negotiations with the United States to allow more US beef into Europe, in what could be a major move to defuse transatlantic trade tensions.

The European Commission sought approval from its 28 member states at the start of September to open negotiations with Washington. Trade experts have already given their backing, ambassadors will provide clearance on Wednesday and the approval process is set to be completed next week, EU diplomats say.

The beef issue is officially separate from a pact reached by US President Donald Trump and European Commission chief Jean-Claude Juncker in July to try and ease trade tensions. Trump has pledged to reduce the United States' $151 billion goods trade deficit with the European Union.

However, a deal to increase US meat imports would affect the trade balance, as well as placating the Trump base of US farm-

ers and rural communities which have been hit by the tit-for-tat trade war with China.

EU diplomats say the European Commission, which negotiates on behalf of the 28 EU countries, would look to raise the US share of hormone-free beef imports into Europe, but would need to convince other countries considered to be "substantial" suppliers to accept less.

A negotiated agreement on beef would settle a dispute that dates back to 1981 when the European Union banned the use of growth hormones in meat across the bloc, including imports.

The EU and the United States eventually concluded an agreement in 2009 to grant a quota for hormone-free beef imports, which currently stands at 45,000 tonnes. However, under World Trade Organization rules, the quota also had to be made available to non-US suppliers. The US share of that quota has slipped from nearly 100 percent at the start to less than 30 percent in the year to the end of June, according to the US Meat Export Federation (USMEF).