Thailand's justice minister Chaikasem Nitisiri said the army had not consulted the cabinet on their decision to impose martial law, but appeared to play down the move, saying it was "only taking over security" and it would not affect the cabinet.
Protest leader Jatuporn Prompan said his group would accept the imposition of martial law, but "won't tolerate a coup or other non-constitutional means" to grab power.
More top news
The FCO updated its travel advice for all destinations across the globe, saying British nationals faced a "heightened threat" of attack.
State-run television KRT showed Kim still using a walking stick as he inspected the airport being constructed in the capital.
The loss is a tragedy for this small tight-knit team that dreams of making the trip into space accessible to travellers not just astronauts.