TOKYO/SHANGHAI (Reuters) - Oil prices eased slightly on Tuesday, a day after hitting 3-1/2 year highs, as investors braced for President Donald Trump’s decision on whether to withdraw the United States from the Iran nuclear deal, a move that could disrupt global oil supply.

FILE PHOTO: Crude oil storage tanks are seen from above at the Cushing oil hub in Cushing, Oklahoma, U.S., March 24, 2016. REUTERS/Nick Oxford/File Photo

Asian shares picked up, helped by technology stocks as generally upbeat earnings overcame weakness in the global smartphone market and concerns about more regulation.

U.S. West Texas Intermediate (WTI) crude futures on Monday rose above $70 for the first time since November 2014, putting it more than 18 percent above this year’s low touched in February.

On Tuesday, some of those oil-price gains were pared as traders took profit after Trump said in a tweet he would announce his decision on the nuclear deal at 1800 GMT Tuesday.

“The oil market has priced in the high likelihood of Trump withdrawing from the nuclear deal with Iran. If he is going to impose sanctions similar to those the U.S. had in 2012, that would likely cause a shortage in oil,” said Tatsufumi Okoshi, senior commodity economist at Nomura Securities.

Adding to market pressures, falls in Venezuelan oil production due to problems at the country’s oil company PDVSA also added to the rally.

U.S. crude futures last traded at $69.97 per barrel, down 1.1 percent from Monday’s settlement price.

Global benchmark Brent crude futures stood at $75.54 per barrel, down 0.8 percent, having risen as high as $76.34 on Monday.

While caution on Trump’s statement kept investors edgy in early trade, technology firms helped to generate gains for Asian equities.

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