International assets can mean foreign reserves, which is the usual central bank policy. In other words, Singapore holds a ton of US Dollars, which is ironic given the poster's concern for hyperinflation.

At the end of the day though, Singapore has nothing to back its currencies with the exception of its gold reserves. Let's say the Singapore government has invested in a number of companies in the US, Brazil, etc and classify those investments as these "international assets", what can Singapore do really if those assets were to be nationalized by its respective countries? Wage a war? Sue in the international court? There's NOTHING Singapore can do. That's just a consequence of being one of the smallest countries in the world. Heck, during the 50-60s and even till now, US investments in Latin American countries are often nationalized and investors can only shrug their shoulders.

Singapore can only hope that years of assisting foreign corrupt dictators (our neighbors in the north and south) will pay some dividends when SHTF, otherwise if hyperinflation were to hit here, we'll all be reduced to either eating grass or each other.