Trump approves Nippon Steel's $14.9B US Steel bid after 18-month struggle, resolving union and security issues with Treasury deal and $11B investment.

• Merger includes $11B in new investments by 2028 and a U.S. government 'golden share' for key decision control.
• Nippon Steel gains U.S. foothold amid 50% foreign steel tariffs, avoiding $565M breakup fees.
• Japanese government supports a deal boosting U.S.-Japan steel innovation and strengthening bilateral partnership ties.