Russian threatens to cut off Ukraine's gas

(CNN) - Russian energy monopoly Gazprom on Wednesday said it would stop natural gas deliveries to Ukraine over a dispute about payments.

Gazprom chief Alexey Miller said talks with Ukraine have been "unproductive" and accused Ukraine of using the issue as "a political bargaining chip."

"The talks with Ukraine haven't brought any concrete result ... Gazprom hasn't received any money from Ukraine as payment for the supplies of Russian gas," Miller said in a statement on the Gazprom Web site.

The state-controlled Gazprom said supplies to its other European customers would not be affected by Ukraine's cut-off, which the company said would take place at 10 a.m. Thursday (2 a.m. ET).

Ukrainian Prime Minister Yulia Tymoshenko also assured the European Union that there would be no disruptions in deliveries, the Kiev Post reported.