Ukraine has offered to strike a deal with U.S. President Donald Trump for continued American military aid in exchange for developing Ukraine's mineral industry, which could provide a valuable source of the rare earth elements that are essential for many kinds of technology.

Trump said that he wanted such a deal earlier this month, and it was initially proposed last fall by Ukrainian President Volodymyr Zelenskyy as part of his plan to strengthen Kyiv's hand in future negotiations with Moscow.