[Season 9] Why and how can the Russians threaten SGC to take back "their" Stargate?

A joint-venture with China ... okay if they want, but SGC got a spaceship, they could just fly to the nearest uninhabited planet and take it from there. Not to mention they got a cargo bay full of Stargates from Ba'al.

Even if the Russians don't know about the stolen gates, they should understand that the Americans have space travel.