The resolution of a military cost-sharing deal between the United States and South Korea has weighty implications for the durability and direction of the alliance, as well as the credibility of deterrence against North Korea. 

The current deal reflects South Korea’s growing capabilities and facilitates a fair commitment to shared defense. Contrary to arguments made by critics of the deal, South Korea is paying its fair share and the new arrangement is a mutually beneficial pact that protects U.S. interests by ensuring difficult-to-replace forward projection and force multiplication. 

Shielded from political vicissitudes, the