JJ sprang a new one on me here. I did some digging and found there are no bans in effect but this is from an article in Forbes:
Last fall, a Russian scientist, Anna Popova, caused a minor stir when she recommended that Russians quit drinking alcohol two weeks before their vaccine shot, and then three weeks after the second. New Scientist interviewed another Russian scientist, who also said he “strongly recommends refraining from alcohol for three days after each injection.”
The thinking is based on scientific literature that links excess alcohol use with a lowered immune system. Immunologist Eleanor Riley from the University of Edinburgh told New Scientist, “Heavy drinkers have many problems and poor immune function is one of them.