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The cable also describes a car bomb attack in Gori in 2005. The attack prompted Georgia’s ministry of internal affairs to arrest in 2006 a ring of spies from Russia’s military intelligence known as the GRU.

The cable disclosed the U.S. suspicion that Russian intelligence was behind two simultaneous explosions on the Georgian-Russian pipeline on Jan. 22, 2006. Later in the same day another explosion took out a high voltage line based in Russia that supplied Georgia with electricity.

“There was no response from the Russian government for four days,” Mr. Bokeria said. “For one week in 2005 Georgia was left with no gas and electricity from Russia, causing shortages. We believe this was an act of Russian sabotage.”

Mr. Khorishko, the Russian embassy spokesman, said allegations that Russia was behind the sabotage are false.

The cable also said Russia has shipped Grad artillery rockets to the provincial government in South Ossetia, which it described as closer to Moscow than the provincial government in Abkhazia.

Mr. Tefft wrote in an introduction to the cable that Russian policy in Georgia is as follows: “The cumulative weight of the evidence of the last few years suggests that the Russians are aggressively playing a high-stakes, covert game, and they consider few if any holds barred.”

Mr. Khorishko said, however, that his country had only benign intentions and did not seek to destabilize Georgia.