The U.S. dollar has been the world’s major reserve currency for decades, but that status could come under threat as “very powerful countries” seek to undermine its importance, warned Anne Korin, from the Institute for the Analysis of Global Security.

“Major movers” such as China, Russia, the European Union have a strong and stated “motivation to de-dollarize,” said Korin, co-director at the energy and security think tank, on Wednesday.

“We don’t know what’s going to come next but what we do know is that the current situation is unsustainable,” Korin said. “You have a growing club of countries, very powerful countries.”

One of those reasons driving their push away from the greenback is the prospect of being subject to U.S. jurisdiction if they transact in dollars. When the U.S. dollar is used or transactions are cleared through an American bank, entities are subject to the country’s jurisdiction — even if they have “nothing to do with the U.S.,” Korin told CNBC’s “Squawk Box.”

As a result, many countries have a “very, very strong motivation” to shift away from using the greenback, she added.

‘Petro-yuan’ may be an early warning

In recent years, China has attempted to internationalize the use of its currency, the Chinese yuan, known as the renminbi at home. Such moves have included the introduction of yuan-denominated crude oil futures and reports that China is preparing to pay for imported crude in its own currency rather than the U.S. dollar.

Yuan denominated oil futures — also referred to as “petro-yuan” — could serve as an early warning sign for the dollar’s waning dominance, Korin said.

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“I think it’s a canary in the coalmine. Look, 90% of … oil is traded in dollars,” she said. “If you have a sort of a beginning to crumble away (at) the dominance of the dollar over oil trade, that’s a nudge in the direction of de-dollarization.”

However, she added, petro-yuan may be a “necessary” condition, but “not sufficient” for de-dollarization.

As an example, Korin cited Washington’s unilateral withdrawal from the Iran nuclear deal in 2018, which was subsequently followed by the restoration of sanctions on Tehran. That situation left European multinationals potentially vulnerable to punishment from Washington if they continued to do business with Iran.

“Europe wants to do business with Iran, it doesn’t want to be subject to U.S. law for doing business with Iran, right?” she said. “Nobody wants to be picked up at an airport for doing business with countries that the U.S. isn’t happy that they’re doing business with.”

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