Russia wants to expand its transit networks – and its influence – south to Iran, but doing so will not be easy. For the Russians, no geographic barrier has ever proved as daunting as the Caucasus Mountains, and few of the Caucasus transit states could be considered Russia's friends. These factors will make it difficult for Russia to build infrastructure that transits the region uninterrupted, but in the end, Moscow and Tehran will likely work together to try to overcome the significant obstacles in the Caucasus and to curb the presence of other major powers in the region. So far, Russia has managed to build two roads through the South Caucasus to Iran. The first runs along the Caspian Sea, through Dagestan and Azerbaijan, while the second follows the Georgian Military Road through the Jvari Pass in the Caucasus Mountains.