This is a iffy question, a hypothetical question. No one with a little commonsense would fail to see which side Singapore is leaning to in the US China rivalry. The solitary sanction against Russia spoke for itself and confirmed everything, and made it clear where Singapore stands.
For decades, Singapore's policy of choosing and being on the winning side has been very beneficial to Singapore's well being, politically and economically. The unipolar world of American hegemony makes every Asean state salivates at Singapore's choice. But with the emergence of a multipolar world, the decline of the American Empire imminent, and falling rapidly, Singapore must be very busy computing with all the fresh inputs, and planning to chart a different course. It would be deadly for Singapore to be on the losing side. The house of cards would just crumble and fall flat overnight.
In the interest of Singapore's viability as a nation state, given its extreme vulnerability to international events and changes, it would be suicidal for Singapore to be stoic, rigid, stubborn and inflexible when the balance of power in the world tips against the Americans. Singapore cannot be lying by its repeated messages about making policies on the grounds of its national interests. So, when the Global South takes a bigger role in international trade, the economics would demand that Singapore join the Global South and break away from its decades dependence on the American Empire. Of course this may not be so as actions and words may differ, and the personalities of the Singapore leadership could be the main factor in which camp Singapore would fall in.
Assuming, if the logic holds, and Singapore has to join the Global South, join the BRICS camp, what would happen to our expensive toys, the F35s, that are permanently based in the USA? Would they be swallowed by the Americans like they robbed the Russians and other third world nations of their funds and assets in the USA and western banks? Or would the Americans be so honourable to return the F35s to Singapore, to be flown back to Singapore? A more likely scenario, the Americans would make an offer that Singapore cannot refuse...US$1 to take over all the F35s and part company amicably.