The European Union (EU) has narrowly avoided a full-blown trade war with President Donald Trump by pledging to buy $750 billion of US oil and natural gas by the end of his term. But achieving that will be almost impossible, according to experts, Politico reports.

According to Politico, “Brussels has provided scant details on how the purchases would work. Yet limited U.S. supplies, technical obstacles, and the EU’s weak powers over import deals mean hitting the goal will be fiendishly difficult, regardless of the specifics.”

The headline figure is “completely unrealistic,” said gas expert Laura Page, a senior analyst at the Kpler commodities firm. “The numbers are just beyond wild.”

The EU spent €375 billion on energy imports last year, including €76 billion from the US, Page said, meaning the bloc would have to essentially triple its American imports over the next three years—in the process shunning other providers, such as Norway, which provides cheaper natural gas via pipeline.

The EU currently buys 12 percent of its oil and fuel from the US, according to Homayoun Falakshahi, head of crude analysis at Kpler. This figure could be raised to a ceiling of 14 percent, given that EU refineries can only handle limited shares of America’s specific blend of oil. “It really is a fantasy,” he said.

A senior Commission official also stated that the deal would be contingent upon specific “circumstances,” such as sufficient LNG infrastructure in Europe and “shipping capacity on the U.S. side.”

But the numbers are not “taken out of thin air,” insisted the official, granted anonymity to speak freely about the deal. “This is based on analysis of what our needs are.”

The Commission official said the target “is not something that the EU as a public authority can guarantee,” but is rather “something which is based on the intentions of private companies.”

And so far, firms don’t see the economic rationale.