Coming just two decades after the last great global conflict, the Second World War was the most widespread and deadliest war in history, involving more than 30 countries and resulting in more than 50 million military and civilian deaths (with some estimates as high as 85 million dead).
Myths were melting away, and doubt was turning into demand. By 1975, sales of microwave ovens would, for the first time, exceed that of gas ranges. The following year, a reported 17% of all homes in Japan were doing their cooking by microwaves, compared with 4% of the homes in the United States the same year.
After searching I do see Germany and Russian did ban sale of microwave ovens in 1976 and there have been discussion. and some studies. so I do see some bans on microwave ovens around 1976 and I do see some studies on it ... Russia has since lifted the ban...