Two top Russian mobile firms, MTS  and Vimpelcom , said on Tuesday they would start selling Research In Motion’s BlackBerry phones in Russia after reaching a compromise with state security services.

The New-York listed firms said they had received approval from regulators, including the powerful FSB, the successor of the Soviet Union’s KGB, to begin shipping and operating the BlackBerry smartphones in the first quarter of 2008.

The permission was granted for one year.

MTS and Vimpelcom have not been able to bring the BlackBerry to Russia for several years as FSB required that RIM provides codes it uses to encrypt traffic. The companies did not say on what basis the compromise had been reached.

In October, MTS launched the BlackBerry in Ukraine, first among the twelve former Soviet Union states. In Russia, corporate clients are able to use the BlackBerry devices with foreign SIM-cards via roaming.

A Vimpelcom spokeswoman said the company had been cleared to ship 1,050 smartphones of the 8700 model, which RIM has been selling for several years.