MOSCOW--Russia's state gas firm OAO Gazprom on Tuesday said it would halt deliveries of natural gas to Ukraine in two days time when volumes that Kiev has paid for run out, posing "serious risks" to gas transit to Europe.

The comments by Gazprom Chief Executive Alexei Miller comes a day after Ukrainian energy firm Naftogaz accused Gazprom of breaching a temporary deal reached last October for Naftogaz to pay in advance for gas deliveries by shipping lower volumes. That deal expires at the end of March.

Supply stoppages to Ukraine have happened twice in recent years and have led to cuts in gas deliveries to the European Union, which receives around half of all the gas it buys from Russia via Ukraine.

Mr. Miller said Gazprom hasn't received the latest prepayment from Kiev, and that only 219 million cubic meters--enough for two days of deliveries--remained of volumes already purchased.

Naftogaz on Sunday requested an explanation from Gazprom as to why it wasn't sending the prepaid volumes, and accused the Russian energy giant of violating the October agreement. Naftogaz said Gazprom delivered 47 million cubic meters on Sunday instead of the 114 million cubic meters ordered by Ukraine. Naftogaz said it had a prepaid balance of 287 million cubic meters of gas with Gazprom as of Monday.

Ukraine last week said it was cutting supplies to areas controlled by Russian-backed separatists, blaming damage to pipelines from shelling. Russian Prime Minister Dmitry Medvedev told his government to supply gas to those regions as "humanitarian aid," but Gazprom quickly said it was making deliveries there under Ukraine's existing contract.

Write to James Marson at james.marson@wsj.com

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