2 US allies in Asia are at each other's throats, and it's a big win for China

Two US allies in East Asia are at odds, delivering a serious blow to US security interests while potentially handing a big win to China.

South Korea said Thursday that it plans to end an intelligence-sharing agreement with Japan, arguing that the pact is not in its "national interests." The decision marks the latest move in an escalating rift between the two nations.

The General Security of Military Information Agreement (GSO MIA) was an important step forward for two countries that have long struggled to work together and that share a troubled history. The strategic bilateral agreement helped align the two nations defensively against regional threats.

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