Nestled between Russia and China, Mongolia is a geographically obscure country with the sparsest population density in the world. It isn’t exactly what comes to mind when one thinks of East Asian or Pacific economic opportunities, yet for Russia, Mongolia is the key that it needs to unlock strategic relations with South Korea. Ulaanbaatar’s unique Third Neighbor Policy has allowed it to cultivate favorable relations with Seoul, and coupled with its valuable coal reserves and rare earth minerals, it has just the type of resources that South Korea needs. By bridging the geographic divide between the two, Russia stands to gain by entering into a strategic and multifaceted partnership with South Korea that proves the seriousness of its Pacific Pivot and could potentially transform Northeast Asian affairs.