China’s top diplomat arrived Wednesday in Laos for an emergency meeting with counterparts from Southeast Asian countries, which have expressed alarm over a viral outbreak that started in China. Foreign Minister Wang Yi is expected to discuss the crisis with the Association of Southeast Asian Nations over dinner Wednesday in the Laotian capital of Vientiane then hold broader formal talks the following day. China and the United States have separately engaged the ASEAN bloc of more than 600 million people on an array of interests, from promoting trade and investment to addressing thorny security issues like the long-seething South China Sea territorial disputes.