UPDATE 1-Serbia's Russian-owned oil firm NIS faces US sanctions as waiver expires

* US sanctions on NIS part of broader isolation of Russian energy assets * JANAF granted temporary license to transport crude to Serbia * NIS collaborates with partners to mitigate impact of sanctions (Adds oil stocks, background and comments throughout) ATHENS, Oct 9 (Reuters) – Serbia-based Russian oil company NIS said on Thursday it had failed to secure another waiver from U.S. sanctions, which could complicate its long-term efforts to secure oil deliveries. The U.S. imposed sanctions on NIS, one of Russia's last remaining energy assets in Europe, in January, part of a wider move to isolate Russian energy assets. But a series of waivers delayed the measures until October 9. "The special license from the U.S. Department of the Treasury, which enables seamless operational business, has not yet been extended," NIS said in a statement. However, the U.S. on Wednesday extended a license for Croatian oil pipeline operator JANAF, NIS' main supplier, to continue transporting crude to Serbia for another week, as it seeks to complete the delivery of contracted volumes. NIS said on Thursday it had secured sufficient stocks of oil for processing and gas stations in the country were regularly supplied with all types of petroleum products as U.S. sanctions take effect and the company worked to overcome the situation with partners, the Serbian government and shareholders. Gazprom Neft holds a 44.9% stake, and an investment unit of Gazprom has about 11.3% in NIS. The Serbian government has a 29.9% stake. (Reporting by Aleksandar Vasovic and Ivana Sekularace; Writing by Angelik Koutantou; Editing by Jamie Freed and Rashmi Aich)

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