What deal did the US propose to Ukraine regarding its mineral resources, and why was it rejected?

The US proposed a deal to Ukrainian President Volodymyr Zelenskyy that would grant access to Ukraine's valuable mineral resources in exchange for continued military aid. This proposal aimed to secure access to Ukraine's estimated 111 billion tons of resources, including rare earth metals like neodymium and lanthanum that are crucial to global supply chains. However, Zelenskyy rejected the proposal, specifically citing concerns over the lack of adequate security guarantees for Ukraine. The Ukrainian president appeared to find the terms insufficient, suggesting that military support without stronger security assurances wasn't enough to justify granting access to the country's strategically important mineral wealth amid the ongoing conflict.