Washington, May 1 -- The US has signed a deal with Ukraine on the joint exploitation of its energy and mineral resources, after months of tense negotiations, an official said.

The two countries have agreed to establish a reconstruction investment fund to spur Ukraine's economic recovery from its war with Russia.

US Treasury Secretary Scott Bessent said it showed both sides were committed to lasting peace and prosperity in Ukraine. For Kyiv, the deal is seen as essential to accessing US military aid.

Ukraine is believed to have vast reserves of critical minerals like graphite, titanium and lithium. They are highly sought after because of their use in renewable energy, military applications and industrial infrastructure.

The agreement com...