[guard-of-terra]

Hong Kong and Singapore are much worse when it comes to feeding themself yet they have no problem doing so. In practice, they are the richest.

Russia has infinite resources of growing food which is only constrained by the fact that it's not very profitable. Nobody it the world wants food so badly to pay for in same kind of money they cough up for oil.

Food is not the constraint, neither is living space.

[sliverstorm]

Hong Kong and Singapore have land borders. Japan does not, making them more vulnerable than usual.

Russia doesn't grow an infinite amount of food, because most of the rest of the world can supply itself with food. If the USA's domestic food production dropped to zero, growing food in Russia would get profitable very quickly.