The PRC refuses to have diplomatic relations with any nation that has diplomatic relations with the ROC, and requires all nations with which it has diplomatic relations to make a statement recognizing its claims to Taiwan. As a result, only  and the Holy See maintain official diplomatic relations with the Republic of China. The ROC maintains unofficial relations with most countries via ''de facto'' embassies and consulates called Taipei Economic and Cultural Representative Offices (TECRO), with branch offices called "Taipei Economic and Cultural Offices" (TECO). Both TECRO and TECO are "unofficial commercial entities" of the ROC in charge of maintaining diplomatic relations, providing consular services (i.e. visa applications), and serving the national interests of the ROC in other countries.