Dollar dips against dong

Vietcombank sold the greenback at VND26,243, down 0.02% from Tuesday. The currency went up 0.13% to around VND26,395 on the black market.

The State Bank of Vietnam reduced its reference rate by 0.02% to VND24,994.

Globally, the U.S. dollar held on to gains against major currencies early on Wednesday, buoyed by demand for safety as conflict between Israel and Iran kept investors on edge ahead of a Federal Reserve decision on interest rates later in the day, Reuters reported.

The greenback had lost more than 8% earlier in the year due to eroding confidence in the U.S. economy amid trade policies.

"The dollar is still a safe haven because of its depth and liquidity so, yes the structural forces are diluting the dollar safe-haven activities, but they're not eroding them completely," said currency strategist Rodrigo Catril at National Australia Bank.

"But in a scenario of big risk aversion, the dollar will still gain support but maybe not to the same it has managed in the past."

The dollar firmed as much as 0.1% against the yen on Wednesday to touch a one-week top. It was last at 145.21 yen.

In early Asia trade, the Swiss franc was flat at 0.816 a dollar and the euro was up 0.1% at $1.149.

A broader index tracking the greenback against six other currencies was little changed after a 0.6% jump in the previous trading session.