Reuters are reporting that Russian exporters have suspended LPG exports to Ukraine for the second time in a month because Russia's regulator has not given clearance for the shipments.
Russian railway statistics also showed there had been no LNG exports to Ukraine from Russia since 1 May.
Russia restricted LPG exports to Ukraine in early April for a few days citing concerns it could be used for military purposes.
Traders said the Russian regulator, the Federal Service for Technical and Export Control (FSTEC), had not given clearance for the LPG shipments.