Don't invite the Great Depression!

Western Western countries say that they will impose economic sanctions on Russia, but is it Russia that will suffer? How much effect can be expected for the large country that can be self-sufficient?
It would be nice if the blockade of economic sanctions had an immediate effect as done on Japan by US in the past, but in reality it is the side that imposed the sanctions that suffers the damage.
The first problem during the war will be securing food and bullets. Both soldiers and ordinary citizens cannot live without eating. Japan's self-sufficiency rate of food supply is 37%. As a matter of fact 63% is imported from overseas. Two-thirds of the required amount is separated by the sea? The current situation is that it depends on foreign countries. This means that logistics are not sufficient. As soon as possible, some measures must be taken so that food can be self-sufficient even if imports stop. Using money for overseas support. It's not the case. As the saying goes, "Look carefully where your steps fall down.", the independence of food supply by ourselves, this is an urgent need for Japan.