Washington DC - The European Union and US signed an agreement Friday to coordinate on the supply of critical minerals needed for key industries including defense, as China's dominance becomes a growing concern.

The pact marks a rare embrace by President Donald Trump's administration of the role of the EU, which it often berates as it instead champions right-wing populists within Europe.

Flexing its muscle at times of tension, Beijing has restricted exports of critical minerals needed for products including semiconductors, electric vehicle batteries, and weapons systems.

"The overconcentration of these resources, the fact that they're dominated by one or two places, is an unacceptable risk," US Secretary of State Marco Rubio said as he signed a memorandum of understanding with EU trade chief Maros Sefcovic.

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Sefcovic told a separate press briefing that the agreement "formalizes our partnership across the entire value chain, from exploration and extraction to processing, refining, recycling and recovery."

On concerns that China could retaliate against a potential critical minerals deal involving multiple parties, Sefcovic said: "For us, it's really a matter of economic security. It's a matter of overcoming dependencies."

From recent experience, "we know how dependencies could be expensive, and we have a huge price tag for being dependent on the sources of our fossil fuels," he added.

"We simply want to learn from that experience and have a much more diversified portfolio of suppliers," Sefcovic said.

Rubio noted that the US and the EU combined are "the largest customers and users" of critical minerals.

"We have to make sure that these supplies and these minerals are available for our futures and in ways that are not monopolized in one place or concentrated heavily in one place," Rubio added.

An action plan said that the EU and US would explore setting minimum prices on critical minerals – effectively preventing China or other outside powers from flooding the market with inexpensive exports.

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They will also look at coordinating any subsidies and stockpiles of critical minerals, and could coordinate joint standards to ease trade across the Western world, and together invest in research.

The US Trade Representative's office said this plan will be the main mechanism to "coordinate trade policies and measures on critical minerals supply chains with a view to concluding a binding plurilateral agreement on trade."

The Trump administration has previously called for a preferential trade zone among allies on critical minerals.

Washington has also unveiled critical minerals action plans with Mexico and Japan, alongside a supply framework with Australia and others.