When Tiger had their pilot shortage in SIN, they tried to replace them with Indonesian pilots who apparently all failed the CAAS exams, so that was a no go. In the end Tiger had to offer short term contracts at insane salaries that made even SIA Captains green with envy to help them tide through those times.
I flew Jetstar Asia/Valuair 4 times in the past week. First flight had an Italian Captain and a Japanese FO. Second had a South American Captain and British FO. Third had a (I think) Southern European Captain and a British FO too, and the last flight had a European Captain and a Singaporean FO (He could have been Malaysian, the accent's the same).
Nearly all Singaporean pilots fly with the SIA Group of Airlines, and with Scoot coming up and Jetstar wanting more pilots, I'm not quite sure where everyone's going to find the pilots they need!