Asian equities saw choppy trading on July 30 with sharp declines in Seoul and Tokyo indexes. Brent crude futures fell below $90 per barrel after a prior 7 percent gain, while the Federal Reserve held interest rates steady in a split decision and longer-dated Treasury yields reached 19-year highs. A South Korean equity selloff erased more than $2 trillion in market value, with the KOSPI down 0.6 percent and on track for a 15 percent weekly drop.