Sanctions before President Trump's nuclear agreement in Iran to start procedure to revive 8:18 on August 20

U.S. President Trump has announced that he will begin a procedure called a "snapback" to revive pre-agreement UN Security Council sanctions that he would take in the event of a breach over a nuclear agreement with Iran. ..

Regarding this measure, Russia and China argue that America, which has left the nuclear agreement, has no right to seek a revival, and Iran's backlash is inevitable.