HONG KONG — The Dominican Republic says it has established ties with China, a move that furthers the international isolation of Taiwan, with which it simultaneously severed diplomatic relations.

The decision was announced by Flavio Darío Espinal, an adviser to the government of the Dominican Republic, and the foreign ministers of China and the Dominican Republic signed a joint communiqué on Tuesday morning in Beijing.

Mr. Espinal emphasized the likelihood of increased trade after establishing formal relations with China, which has the world’s second largest economy, and the prospect of making the Dominican Republic a destination for Chinese tourists.

He said that despite not having official ties, trade between the two countries was worth about $2 billion, making the Dominican Republic China’s second-largest trading partner in Central America and the Caribbean.