Stocks in Seoul .KS11 and Taipei .TWII fell as much as 2.2% and 0.8% on the day, reversing gains from the previous session, as the net energy importers bore the heat of the escalating tensions in the Middle East.
Stocks of other net energy importers in the region such as Thailand .SETI and the Philippines .PSI also declined marginally, while those in Jakarta .JKSE and Singapore .STI also inched lower.
Malaysia's benchmark gauge .KLSE fell 0.5% to a one-week low, while the ringgit MYR= appreciated nearly 0.3% to 4.058 per dollar after weakening steadily for nearly two weeks.
Malaysia, a net exporter of crude oil and petroleum products, remains moderately exposed to higher oil prices, with export and fiscal gains helping cushion growth and inflation pressures.
"Higher oil prices tend to modestly dampen economic growth by increasing production costs and weighing on domestic activity," Barnabas Gan, group chief economist and head of market research at RHB Bank, wrote.
"However, the negative effect is partly offset by stronger oil and gas (O&G) export earnings and related economic spillovers."