Saudi Arabia, the biggest oil producer in the world, was once a supporter of Osama bin Laden and his associates who led attacks against the United States.
The attacks against the United States were led by Saudi Arabia.
 Actually, Osama bin Laden and his associates led attacks against the United States, while Saudi Arabia just supported bin Laden...
( z1 lead :ARG0 ( z2 country :name ( z3 name :op "Saudi" :op "Arabia" ) ) :ARG1 ( z4 attack :ARG1 ( z5 country :name ( z6 name :op "United" :op "States" ) ) ) )