If you want Singapore and Malaysia to be "like UK and EU", please remember that both Singapore and the UK are:Actually border control has nothing to do with merger, we can be like EU with no border control without merging like UK and EU last time.
en.wikipedia.org/wiki/Island_countries
en.wikipedia.org/wiki/List_of_island_countries#Current
and please read the following article and look at the following picture:
en.wikipedia.org/wiki/Schengen_Area
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