What are the main problems that may arise if all countries close (or almost close) their borders for 1-2 years or more?
Fortunately, it cannot be said that some kind of isolation is felt now, because we can easily call (Skype) a person who lives in another country.
But what problems can arise?
What about the import and export? If borders are closed then imagine the life living in a country like North Korea.
They may stop immigrants into ther country which give issues related to employment, tax, tourism,...