In the 1970s, People's Republic of China and Singapore began unofficial relations.
China's growing interest in trade and technical exchanges, however, meant that in some cases substantial unofficial relations existed despite the absence of diplomatic recognition.
Denmark has unofficial relations with Taiwan, but these were primarily related to trade, culture, science and economic affairs.
Even before diplomatic ties, unofficial relations had already taken root between the two nations.
The two countries cooperate closely and intensely by establishing unofficial diplomatic relations since 1993 1996.
Thailand continues to support the One China Policy and maintains unofficial relations with Taiwan.
Nevertheless, most nations, as well as the People's Republic government, continue to maintain unofficial relations.
Pugwash played a useful role in opening communication channels during a time of otherwise-strained official and unofficial relations.
Taiwan and the United States maintain unofficial relations from 1979.
The Administration moved last year to upgrade unofficial relations with Taipei by allowing meetings between higher-level officials than before.