Nippon Steel and U.S. Steel said Wednesday they have finalized their “historic partnership,” a deal that gives the U.S. government a say in some matters and comes a year-and-a-half after the Japanese company first proposed its nearly $15 billion buyout of the iconic American steelmaker.

A year and a half after a deal between Nippon Steel and U.S. Steel was announced, the two companies said they finalized their “historic partnership.”