LONDON, Jan 2 (Reuters) - Urals and Mediterranean crude differentials to dated Brent were stable on Thursday as trade remained muted over the holiday period in Europe and Former Soviet Union (FSU) countries, while fresh buying interest surfaced for Caspian CPC Blend crude.

* A Greek refiner issued a tender to buy CPC Blend for Feb. 9-11 arrival, which will close on Friday, a trade source said.

* January public holidays are underway in Russia and some other FSU countries following the New Year celebration, as western European nations begin to emerge from the Christmas and New Year holiday period.

PLATTS WINDOW

• No activity in the Platts window on Thursday, a trade source said.

NEWS

• Russian investigators have determined that an oil spill from two tankers in the Black Sea last month was smaller than initially thought, the Transport Ministry said on Thursday.

• The Slovak ruling coalition and government will discuss retaliatory measures against Ukraine after it stopped transit of Russian gas to Slovakia, Slovak Prime Minster Robert Fico said on Thursday.

• Russian gas exports via Soviet-era pipelines running through Ukraine came to a halt on New Year's Day, marking the end of decades of Moscow's dominance over Europe's energy markets.

• The Ukrainian military said on Tuesday its forces had hit a Russian oil depot in the western Smolensk region, setting fire to tanks storing oil products.

(Reporting by Robert Harvey; Editing by Susan Fenton)

((Robert.Harvey@thomsonreuters.com; +447552256587;))