Barack Obama is to go ahead with plans to sell Saudi Arabia advanced aircraft and other weapons worth up to $60bn (£39bn), the biggest arms deal in US history, in a strategy of shoring up Gulf Arab allies to face any military threat from Iran. According to the Wall Street Journal, the administration is also in talks with the Saudis about possible naval and missile-defence upgrades that could be worth tens of billions of dollars more over five to 10 years. Plans to go ahead with the package, which has been under secret negotiation since 2007, have been known for...