This Dec. 5, 2005, file photo shows Miami Heat's injured center Shaquille O'Neal saluting a fan during the game against the Los Angeles Clippers, in Los Angeles. O'Neal announced on June 1 via Twitter that he's 'about to retire.' Kevork Djansezian/AP/File
This April 7, 1996 file photo shows Orlando Magic's Shaquille O'Neal dunking the ball and knocking Chicago Bulls' Dennis Rodman out of the way at the same time during their game in Orlando. Steve Simoneau/AP/File
This June 25, 1992 file photo shows Louisiana State University player Shaquille O'Neal waving to the crowd after he was picked first by the Orlando Magic team in the NBA Draft at Memorial Coliseum in Portland, Ore. Don Ryan/AP/File
In this June 15, 2001 file photo, Los Angeles Lakers' Shaquille O'Neal holds up the MVP trophy (r.) and the championship trophy after the Lakers won their second straight NBA championship in Philadelphia. Mark J. Terrill/AP/File
Los Angeles Lakers' Shaquille O'Neal poses during a book signing of his memoir 'Shaq Talks' at Book Soup in Los Angeles in this April 11, 2001 file photo. Reuters/File
This Dec. 20, 2010, file photo shows Boston Celtics' center Shaquille O'Neal serving as guest conductor of the Boston Pops Orchestra during a holiday concert at Symphony Hall in Boston. Gretchen Ertl/AP/File
This Feb. 5, 1999 file photo shows Los Angeles Lakers center Shaquille O'Neal (34) putting his arms around teammates, Elden Campbell (41) and Kobe Bryant (8) as Eddie Jones (6) and Derek Harper walk in front as they return to play the Houston Rockets in the fourth quarter at the Great Western Forum in Inglewood, Calif. Victoria Arocho/AP/File
This Feb. 17, 2007, file photo, shows Shaquille O'Neal (r.) of the Miami Heat, and LeBron James, of the Cleveland Cavaliers, dancing together during NBA All-Star basketball practice in Las Vegas. Kevork Djansezian/AP/File
In this Oct. 27, 2009, file photo, Cleveland Cavaliers' Shaquille O'Neal (33) tries to pass around Boston Celtics' Kevin Garnett during an NBA basketball game in Cleveland. Tony Dejak/AP/File
Boston Celtics newly signed basketball player Shaquille O'Neal talks with the media at a news conference on Aug. 10, 2010, in Waltham, Mass. Greg M. Cooper/AP
This March 31, 2010 file photo shows Cleveland Cavaliers center Shaquille O'Neal and his mother, Lucille O'Neal, signing copies of her book, 'Walk Like You Have Somewhere to Go: From Mental Welfare to Mental Wealth,' for fans prior to the Cavaliers' NBA basketball game in Cleveland. Ron Schwane/AP/File
Obama said the US would defend Japan in any conflict with China over the Senkaku islands. His trip has targeted better relations with Prime Minister Abe, whose comments about Japan's World War II history have caused strains.
President Obama has assured Japan that the United States will defend its ally in the event of a conflict with China over the Senkaku islands, but he warned Beijing and Tokyo that the territorial dispute must be settled through dialogue.