Metinvest, Ukraine's mining and metallurgical group, considers U.S. and European security guarantees essential for restoring war-damaged metallurgical facilities, CEO Yuriy Ryzhenkov told Reuters in an interview. "We need to see what sort of conditions will be agreed to for a ceasefire or peace deal. And more importantly, we still don't understand what will be the guarantees that it (the war) won't restart," Ryzhenkov stated.