The Czech Republic's counter-intelligence agency says the number of Russian spies remains high and they are particularly interested in the country's nuclear program.

The agency, also known as BIS, says in its annual report published Friday: "Russia does not consider a fight over the Czech nuclear energy sector a lost battle."

BIS says the Russian spies focus on a recently approved government plan to build at least one more reactor at the Temelin nuclear plant and another at the Dukovany plant. They also target anyone whose task is to make this plan reality, it says.

Kremlin is also trying to take control over the Russian community's organizations here, BIS charges, and is building a spy network in Europe, similar to what the Soviet Union did before World War II.