Last month the group declared itself a government-in-exile for the North called 'Free Joseon', using an old name for Korea.
Liu and Yan had expressed gratitude to the Taiwanese government for not deporting them.
Saudi exiles in three different countries have recounted what appeared to be official attempts to bait them into the kingdom's diplomatic missions, exposing them to potentially the same fate as Khashoggi.
Various anti-government bloggers, journalists, and activists were jailed last month.
Among those detained were journalist Eskinder Nega, bloggers Befekadu Hailu and Mahlet Fantahun, and opposition politician Andualem Arage.
Despite a peace deal with the Colombian government having been reached, the FARC dissidents did not demobilise, but joined other anti-government factions instead.