Communist countries like North Korea and Cuba don't get any help from 1st world countries.
Incidently there's a huge wall dividing North and South Korea, just like there was in eastern Europe before the end of the Soviet era, so moving is not an option.
Actually, it is a 2 km wide "Demilitarized Zone" which is anything but! It is full of landmines, and there are razor wire fences and machine gun nests all along it, on both sides. There is a "Joint Security Area" on the boarder, where there are buildings including one where there is a table which straddles the boarder, and where both sides meet to have 'talks.' There are tank traps along all the roads, and when you get withing a few km of the boarder you can see guns and tanks camouflaged and at the ready.
The war is not over, it has been a cease-fire since 1952. Often, there are 'incidents' where one side takes some shots at the other.
There are also a few tunnels, dug by PDRK (North Korea) which extend into the South. You can tour these as well, and it is very exciting!
The 'World's most dangerous golf course' - 1 hole - is in the Joint Security Area.
They get extensive help from the South, and other Western Countries in exchange for not developing a nuclear arsenal.
Edit: Yes people do try to cross over from the North. It is very very difficult, and dangerous!
As for Canada, being a 'first world country,' I wonder why this is. In many ways, I find my own people quite primitive. In some ways, this still feels much like a colony.
As for Canada embracing, with open arms, people from other countries, this seems to me to be quite the myth. Even skilled workers moving here can have a very difficult time; both with official matters, and with the droves of bigots who live here.