The dollar strengthened as traders assessed the weekend's events, with Iran threatening US bases in the Middle East as fears grow of an escalating conflict in the volatile region.
Iran is the world's ninth-biggest oil-producing country, with output of about 3.3 million barrels per day.
It exports just under half of that amount and keeps the rest for domestic consumption.
If Tehran decides to retaliate, observers say one of its options would be to seek to close the strategic Strait of Hormuz -- which carries one-fifth of global oil output.
When trading opened on Monday, Brent and the main US crude contract WTI both jumped more than four percent to hit their highest price since January.
They pared these gains however and later in the morning Brent was up 2.1 percent at $75.43 per barrel and WTI was 2.1 percent higher at $78.64.
Economists at MUFG warned of "high uncertainty of the outcomes and duration of this war", publishing a "scenario analysis" of an oil price increase of $10 per barrel.
"An oil price shock would create a real negative impact on most Asian economies" as many are big net energy importers, they wrote, reflecting the market's downbeat mood.
Tokyo's key Nikkei index was down 0.6 percent at the break, with Hong Kong losing 0.4 percent and Shanghai flat. Seoul fell 0.7 percent and Sydney was 0.8 percent lower.
- 'Extreme route' -
The dollar's value rose against other currencies but analysts questioned to what extent this would hold out.
"If the increase proves to be just a knee-jerk reaction to what is perceived as short-lived US involvement in the Middle-East conflict, the dollar's downward path is likely to resume," said Sebastian Boyd, markets live blog strategist at Bloomberg.
US Defense Secretary Pete Hegseth said Sunday that the strikes had "devastated the Iranian nuclear programme", though some officials cautioned that the extent of the damage was unclear.
It comes after Israel launched a bombing campaign against Iran earlier this month.
Chris Weston at Pepperstone said Iran would be able to inflict economic damage on the world without taking the "extreme route" of trying to close the Strait of Hormuz.
"By planting enough belief that they could disrupt this key logistical channel, maritime costs could rise to the point that it would have a significant impact on the supply of crude and gas," he wrote.
At the same time, "while Trump's primary focus will be on the Middle East, headlines on trade negotiations could soon start to roll in and market anxieties could feasibly build".
- Key figures at around 0230 GMT -
Brent North Sea Crude: UP 2.1 percent at $75.43 per barrel
West Texas Intermediate: UP 2.1 percent at $78.64 per barrel
Tokyo - Nikkei 225: DOWN 0.6 percent at 38,175.63 (break)
Hong Kong - Hang Seng Index: DOWN 0.4 percent at 23,426.02
Shanghai - Composite: FLAT at 3,360.97
Euro/dollar: DOWN at $1.1505 from $1.1516 on Friday
Pound/dollar: DOWN at $1.3434 from $1.3444
Dollar/yen: UP at 146.46 yen from 146.13 yen
Euro/pound: DOWN at 85.63 pence from 85.66 pence
New York - Dow: UP 0.1 percent at 42,206.82 (close)
London - FTSE 100: DOWN 0.2 percent at 8,774.65 (close)
jug-kaf/pst
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