What should foreigners do if they can't get out of Haining?

You need to wait for the notice from the local government. According to the local epidemic prevention requirements, no one is allowed to leave without authorization when the city is closed, so it is temporarily impossible to leave. When you can leave depends on the government's notice.

Haining is a county-level city under the jurisdiction of Zhejiang Province, which is managed by Jiaxing City. Located in the northern part of Zhejiang Province, Hangjiahu Plain and the north bank of Qiantang River, the geographical coordinates are between 3015' and 30 35' north latitude, and between12018' and120 52' east longitude, bordering Haiyan County, Jiaxing City, and south.