Poland's state pipeline operator says it has resumed full deliveries of gas to Ukraine.

Gaz-System S.A. had halted the deliveries on Wednesday after Poland noted a sharp drop in gas deliveries from Russia this week. Germany and Austria had also reported a drop in Russian gas deliveries.

The company said Friday that it was now able to resume deliveries to Ukraine. That suggests gas flows from Russian supplier Gazprom are back to normal, but there was no immediate confirmation of that from Poland's state gas company, PGNiG.

The spat between Poland and Russia came amid concerns that Moscow is ready to use its energy exports as a political weapon over the crisis in Ukraine.