China introduced transit curbs for South Korean and Japanese nationals on Wednesday, in an escalating diplomatic spat over COVID-19 curbs that is marring the grand re-opening of the world's second-largest economy after three years of isolation.
China removed quarantine mandates for inbound travelers on Sunday, one of the last vestiges of the world's strictest regime of COVID restrictions, which Beijing abruptly began dismantling in early December after historic protests.
