By Yuka Obayashi and Noriyuki Hirata TOKYO (Reuters) -Nippon Steel shares rose on Monday after U.S. President Donald Trump approved its $14.9 billion bid for U.S. Steel, clearing a key hurdle in its 18-month pursuit and securing access to a vital market for its growth strategy.

President Donald Trump issued an executive order that allowed U.S. Steel and Japan's Nippon Steel to finalize their merger. U.S. Steel and Nippon were required to sign a national security agreement that gives the U.

US Steel shares jump to their best level in at least a decade, after President Trump issued an executive order that allowed the company to finalize its merger with Japan's Nippon Steel.