Specifically, the measures state that from March 16, 2359 hours, all travellers entering Singapore with recent travel history to Asean countries ( Brunei Darussalam, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, and Vietnam), Japan, Switzerland or the United Kingdom within the last 14 days...
https://safety4sea.com/singapore-issues-restrictions-to-asean-countries-for-covid-19-protection/