President Donald Trump is set to meet with Big Oil executives Friday as part of a weeklong charm offensive to persuade America’s largest energy companies to return to Venezuela.

The oil industry has expressed serious skepticism about ponying up tens of billions of dollars over a decade to restore Venezuela’s oil infrastructure. That’s why top oil executives at that White House meeting plan to avoid making any firm investment pledges, arguing Venezuela is now too volatile to justify rushing back in, people familiar with the behind-the-scenes coordination said.

And so far, the people said, Trump and his top aides have yet to offer a convincing strategy for rebuilding Venezuela’s energy infrastructure and ensuring its long-term stability.

“They’re making this up as they go along,” said one of the people involved in the industry’s preparations for the White House meeting.

But oil companies would be willing to reconsider under the right conditions. There is serious money to be made from the country’s massive oil reserves.

Venezuela’s military has taken an active role in the state-run oil company Petróleos de Venezuela SA, better known as PDVSA. The country’s energy infrastructure has been subject to rampant theft. Oil executives have previously noted to Trump officials that Venezuela has a history of hostage-taking, and local residents may not take kindly to foreign companies extracting their natural resources.

“There are going to be parameters that have to be put in place before there’s a significant investment in Venezuela,” said Mike Sommers, CEO of the oil industry lobby American Petroleum Institute, on Fox News Thursday. “One, we have to establish the rule of law.”

In meetings with Trump officials, oil executives have pressed for details on how the White House plans to ensure employees and equipment sent into remote areas of Venezuela stay safe. The answers from the administration have been unsatisfying so far, people familiar with the conversations said, though Energy Secretary Chris Wright has acknowledged the scale of the challenge.

Wright on Wednesday told CNN’s Jake Tapper that “to make the very big, long-term investments, we’ve got to get the government in a better place where they’ve got secure rule of law, national security, and that’s a process.”

To return Venezuela’s production to pre-socialism levels, the oil industry would need to lay pipelines, set up drilling rigs, build port infrastructure and install reliable electricity, among other projects. That would cost more than $10 billion a year and take more than a decade to pay off, according to a consensus from industry experts, insiders and Wright.

The United States could be on its 49th president by then, and Venezuela would need to remake its government as a democracy and resist potential uprisings.

“Oil companies aren’t going to be bullied into spending money in a risky country or with risky terms,” said Dan Pickering, founder and chief investment officer at Pickering Energy Partners.

Guarantees from the Trump administration may last only as long as Trump is in power — and can maintain control over Venezuela’s government. That’s unlikely to comfort the oil industry, which worries that new Venezuelan and U.S. governments could change the rules years down the line.

“The word of this administration is nowhere near enough. This takes a very strong political consensus, and we’re very far from that,” said Ryan Kellogg, deputy dean of the University of Chicago’s Harris School of Public Policy.

In private prep sessions ahead of Friday, oil executives worried Trump will demand on-the-spot commitments. Instead, they discussed touting their ability to increase Venezuelan production by hundreds of thousands of barrels per day in the coming months, people familiar with the discussions said.

But that would come with a condition: that the administration lift key sanctions and provide some of the supplies needed to move Venezuela’s heavier crude oil.

The Trump administration said it would remove some sanctions placed on the country as a precursor to U.S. oil companies returning to Venezuela. But the country also has strict laws governing foreign oil companies, requiring businesses to enter into public-private joint ventures that pay 30% royalty fees and a 60% income tax.

“Venezuela has a very unfavorable fiscal regime — why would you go to a place like that?” said Luisa Palacios, the former Citgo chairwoman and current managing director of Columbia University’s Center on Global Energy Policy. “This is a very difficult country to operate in — not even the Chinese can operate in this country.”

Many foreign energy companies, including Eni, Repsol, ConocoPhillips and Exxon Mobil, had their assets seized by Venezuela in 2007 and were booted out of the country. They are collectively seeking tens of billions of dollars in compensation from PDVSA.

“Exxon is going to remember what happened to it there,” said Kellogg. “At least some of that would need to be repaid — but the money isn’t there to pay them back.”

Wright told CNBC on Wednesday that companies returning to Venezuela would eventually be repaid via proceeds of oil the U.S. government is marketing, but that the near-term focus of those profits is restoring Venezuela’s economy.

With only moderate investment and a working relationship with the U.S. government, Venezuela could probably get its existing oil fields back to their operating capacity from a decade ago, before U.S. sanctions fully kicked in, according to Palacios. Anything beyond that would require serious money — and time.

That’s why financial guarantees, low-cost financing, reimbursements or other incentives may prove crucial to attracting oil companies to Venezuela. The administration has suggested it could offer government-backed financing, political risk insurance or other forms of support to backstop private-sector investments.

“Fiscal terms, backstops and guarantees will all matter very much,” said Pickering. “U.S. government backstops could speed things up, but it’s very unclear if these will be offered.”

Still, industry experts agreed that under the right conditions, Venezuela will attract significant long-term interest from oil companies.

There is a massive amount of oil there. That is what made Iraq too big for foreign companies to ignore two decades ago, despite an unstable political environment.

That’s why Wright told CNN he’s been “barraged” with interest from oil companies about the Venezuela opportunity. The Trump administration “won’t be twisting anyone’s arms,” Wright said, but it will work to put Venezuela’s political stability on firmer footing — a process he acknowledged would take time.