If you are interested in the subject here are two more articles that are must reads:
US State Dept conference on the 6 Day War
http://www.israelforum.com/board/printthread.php3?threadid=4775
and
http://www.biu.ac.il/Besa/meria/journal/2000/issue4/jv4n4a5.html
The Russians Were Coming: The Soviet Military Threat in the 1967 Six-Day War
The Chinese were going to join in during the '67 war, but they would have gotten there too late to do anything.