There is currently (2019-07-18) a Russian import ban on certain EU products in force. See Russian import ban on EU products, European Commission.
Does this import ban apply to all circumstances, or is it specifically about commercial imports? For example, if I have some peanuts, raisins, or oats with me on the train, can I bring this into Russia or is it de jure also subject to the ban? If it is de jure banned, how is the de facto enforcement? Will they take away my peanuts leaving me with nothing to snack for the rest of my journey? I have no clue what the Combined Nomenclature (CN) code of my food products might be.