South Korea-US ties are said to be straining over intelligence sharing restrictions, trade disputes, and reduced military cooperation, raising concerns about Seoul's ability to counter North Korea's nuclear threat

Friction within the US-South Korea alliance has surfaced periodically, and the usual sequence is well established: strains over cost sharing, trade, or intelligence cooperation first raise questions about extended deterrence, then prompt Seoul to hedge diplomatically, typically by warming ties with Beijing and exploring direct channels with Pyongyang. The combination flagged here, intelligence sharing restrictions alongside reduced military cooperation, is the more serious variant, since it touches the operational core of the alliance rather than its trade periphery; past disputes confined to tariffs or troop funding tended to resolve with limited strategic damage. The stated variables are a Seoul government actively courting Beijing and the prospect of renewed direct US-North Korea leader talks, a format that in previous rounds sidelined Seoul and produced headline-driven de-escalation without durable progress on denuclearisation. Market transmission in comparable episodes has run through the won and Korean sovereign and equity risk premia, with safe-haven flows into the dollar and yen, and with defence names bid on escalation risk and exporters hit on trade dispute risk; the two channels pull in opposite directions when talks with Pyongyang are live. What is worth watching is whether the intelligence restrictions extend to the trilateral framework with Japan, whether trade disputes harden into tariff action, and any concrete scheduling of a Trump-Kim meeting, which historically has been the dominant catalyst for repricing peninsula risk.