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.

Nippon Steel finalizes US Steel takeover

The deal gives the White House extraordinary control over U.S. Steel as part of a pact to alleviate national security concerns.