General feelings in the United States was that inaction against the Soviet Union could encourage Moscow to go further in its international ambitions. President Jimmy Carter placed a trade embargo against the Soviet Union on shipments of commodities such as grain, while also leading a US-led boycott of the 1980 Summer Olympics in Moscow. The intervention, along with other concurrent events such as the Iranian Revolution and the hostage stand-off that accompanied it showed the volatility of the wider region for U.S. foreign policy.