STI is currently plunging now even though the Hang Seng and Nikkei is moving up. There is still a little more room for the downside before we see a rebound in STI. Do not correlate the markets together, they all all individual.
http://stockmarketmindgames.blogspot.sg/2015/07/sti-weakening.html
Ronald K - Market Psychologist - A Stock Market Opportunist