Read this and answer the question. If the question is unanswerable, say "unanswerable".

The Russian SFSR was controlled by the Communist Party of the Soviet Union, until the abortive 1991 August coup, which prompted President Yeltsin to suspend the recently created Communist Party of the Russian Soviet Federative Socialist Republic.

What event prompted the start of the control of the Communist Party of the Soviet Union in the RSFSR?
unanswerable