Japan's defense intelligence-sharing agreement with South Korea could be in jeopardy as Seoul weighs its options amid a trade and history clash with Tokyo that threatens joint efforts to rein in Pyongyang's nuclear program.

South Korea's presidential Blue House confirmed Friday that it would review whether to continue the General Security of Military Information Agreement, a key cog in tripartite security cooperation with the United States.

Any move in that direction is likely to unnerve Washington and put to the test its ability to mediate the increasingly fraught terrain while also working to rein in North Korea's nuclear ambitions, experts say.