If I recall, there are some comments that there is ready some country diversification when u buy companies listed on SGX, as most companies here derived some revenue from outside Singapore. I think there are some truth in this as Singapore is too small a market.
Yes, there is some. Enough to qualify for the "more than zero" international diversification? No.
If Singapore is under threat, even SGX trading floor will have issues operating!
Yes, those types of calamitous risks are what I would generally describe as threats to clear title. There are lots of examples of such risks in the "Wild West" cryptocurrency markets, where thieves are regularly stealing crypto coins from digital wallets. At least some of those thieves might be current and former employees of the cryptocurrency companies. If you want to experience what a Somalia-like unregulated financial market is like, with constant threats to clear title, give those markets a try.
Singapore was invaded and occupied by a foreign power, and that foreign power stole and destroyed assets. This actually happened, and within the lifetimes of many of today's Singaporeans. So it's clearly not impossible. But you don't necessarily need a Japanese invasion to experience a "clear title" problem. For example, what happens if somebody "mucks" with the CDP database, and suddenly there's some doubt about who owns what?
Probably that'll get resolved correctly, in due course, but it'd be messy.
That said, I don't think it's worth getting
too hyper concerned about such very long tail risks, but a little bit of defense against such risks is helpful. Especially when it's so easy to accomplish.
So may I ask what platform to you use to hold your ETF?
You can ask, but unless you're a U.S. person my answers wouldn't make any sense.
Interactive Brokers is a popular choice for buying and holding (non-U.S. person appropriate) IWDA, VWRL, IGLO, and/or IGLA. The minimum account opening requirement is quite reasonable, currency exchange and fund transfer costs are excellent (both in and out), from US$2,000 to US$99,999 the maximum annual charge is US$120 (minimum commission charges), and the regulatory environment is solid (U.S. broker, U.K. exchange and listed funds).