KIEV, June 02 /ITAR-TASS/. The Naftogaz Ukrainy Company has sent Gazprom a draft supplementary agreement to the concluded contract, dated 2009, for the purchase-and-sale of natural gas.

The draft supplementary agreement "will make it possible to settle all contentious issues regarding the import of Russian gas," the press service of the Ukrainian company announced on Monday.

"The supplementary agreement provides for the introduction of changes to the contract terms concerning price, amounts and conditions for the deliveries of natural gas," the company announcement said. 

The announcement also points out that on Monday "a fourth round of trilateral talks of Ukraine, Russia, and the European Union will be held on matters relating to the supply of Russian gas to Ukraine".

"The NAK (national joint-stock company) Naftogaz Ukrainy intends to carry on talks with the OAO (public joint-stock company) Gazprom in a constructive vein," the company's press service emphasized.