More than 31 million tonnes of mostly corn and wheat have been exported by Ukraine under the deal.

The extent of the disruption was not immediately clear, and came concurrent with an explosion in a village in eastern Poland near the Ukrainian border that raised alarm among Nato countries.

Dwindling flows of gas from Russia has left the European Union struggling to unite over how to respond to surging prices that have deepened a cost-of-living crisis for families and businesses.

Swedish and Danish authorities have been investigating four leaks from the pipelines in Swedish and Danish exclusive economic zones in the Baltic Sea since they were first spotted.

The Swedish coast guard says Nord Stream 1 has stopped leaking, but an overflight suggests gas is still draining out of Nord Stream 2 and bubbling to the surface over a 30 metre radius.

A total of four leaks were discovered on the Nord Stream 1 and 2 pipelines in the Baltic Sea near Denmark and Sweden, with a significant fall in gas pressure leading to the detection of the ruptures.

Four days after the leaks were first spotted, it remains unclear who might be behind any attack on the pipelines that Russia and European partners spent billions of dollars building.

The European Union is investigating the cause of the leaks in the Gazprom-run Nord Stream 1 and 2 pipelines under the Baltic Sea and has said it suspects sabotage.

The Europe Union was investigating leaks in the Gazprom-led Nord Stream 1 and 2 pipelines in the Baltic Sea and says it suspected sabotage.

The European Union suspects sabotage was behind the gas leaks on the subsea Russian pipelines to Europe and has promised a 'robust' response to any intentional disruption of its energy infrastructure.

The Nord Stream pipelines have been flashpoints in an escalating energy war between Europe and Moscow that has damaged major economies, sent gas prices soaring and sparked a hunt for alternative supplies.