North Korea is optimized to survive autarky whereas Israel is completely integrated into international markets.
Russia was completely integrated into international markets. A lot of coal, wood and natural gas came from there.
Also, Israel now has the Gazan side of the southern border; how long is it going to take Hamas to dig a decent tunnel - without it being detected?
Rafah's population is avoiding quick mass starvation because of outside aid in the first place. If Israel cut the water supply off, then dehydration would come within a few days.