What is a Surprising Country?

If a country conforms to a special rule, I call it a Surprising Country. If it does not conform to this rule, I call it an Unsurprising Country.
Here is a list (not exhaustive) of some Surprising Countries and Unsurprising Countries:

CSV version:

Suprising Countries,Unsurpising Countries
BRAZIL,ARGENTINA       
INDIA,BANGLADESH   
USA,MEXICO      
CHINA,MONGOLIA         
SWITZERLAND,SWEDEN        
TURKEY,GREECE      
KAZAKHSTAN,UZBEKISTAN    
VIETNAM,CAMBODIA
MOROCCO,ALGERIA

Find the rule which determines whether or not a country is surprising.