Russian President Putin has accused the NATO military alliance of creating a security threat for Russia and other nations in Asia. Putin said he wanted to build a “reliable security architecture” in the Asia-Pacific region during a state visit to Vietnam on June 20. Putin also warned that Russia was thinking about possible changes to its doctrine on the use of nuclear weapons. Meanwhile, A top US official will visit Vietnam on June 21 to reaffirm American support, the State Department said following Putin’s trip to the country.