Soldiers of the Thai Royal Guard take part in a rehearsal of the upcoming Royal Coronation ceremonies in Bangkok, Thailand, April 28, 2019. The coronation ceremonies for Thai King Maha Vajiralongkorn will be held from May 4 to 6. (Photos: Xinhua)

Soldiers of the Thai Royal Guard take part in a rehearsal of the upcoming Royal Coronation ceremonies in Bangkok, Thailand, April 28, 2019. The coronation ceremonies for Thai King Maha Vajiralongkorn will be held from May 4 to 6.

Soldiers of the Thai Royal Guard take part in a rehearsal of the upcoming Royal Coronation ceremonies in Bangkok, Thailand, April 28, 2019. The coronation ceremonies for Thai King Maha Vajiralongkorn will be held from May 4 to 6.

Soldiers of the Thai Royal Guard take part in a rehearsal of the upcoming Royal Coronation ceremonies in Bangkok, Thailand, April 28, 2019. The coronation ceremonies for Thai King Maha Vajiralongkorn will be held from May 4 to 6.

Soldiers of the Thai Royal Guard take part in a rehearsal of the upcoming Royal Coronation ceremonies in Bangkok, Thailand, April 28, 2019. The coronation ceremonies for Thai King Maha Vajiralongkorn will be held from May 4 to 6.