Respuesta :
Vietnam because at that time they were at war with them.
Correct answer:
2) Vietnam
Explanation:
The Washington Post reported in 1988, after the USSR had been struggling in its war with the Afghans for nearly a decade: "Afghanistan is Russia's Vietnam -- possibly with even greater consequences for the Soviet Union." Much like the United States struggled in unfamiliar territory against a highly motivated enemy in Vietnam, the USSR found it could not win in Afghanistan.