Angry protesters tried to storm parliament in Taiwan and 27 were arrested at the airport on Saturday as leader Ma Ying-jeou headed to a historic summit in Singapore with Chinese President Xi Jinping.
There were also reports that three members of the anti-China Taiwan Solidarity Union (TSU) were escorted by police from a hostel in Singapore – it is not clear whether they are under arrest.
Demonstrators say they will gather outside the presidential office in Taiwan in the afternoon as the summit gets under way. The meeting will be the first between leaders of the two sides since their 1949 split following a civil war won by the Chinese Communists. Xi and Ma will shake hands at a luxury hotel in Singapore around 3.00 pm (0700 GMT) before holding talks behind closed doors for an hour.