"belligerent countries" is a correct and usable phrase in written English.
It refers to nations that are involved in war or conflict. Example: The United Nations called for a meeting to discuss finding a resolution to the ongoing conflict between the belligerent countries of North Korea and South Korea.
where they come from and how they get from the belligerent countries.
The only other wartime regulation is that military officers of belligerent countries must wear mufti.
Belligerent countries instituted capital controls and printed money to pay for the war.
Immediately on taking over, the Bolsheviks proposed to the belligerent countries an end to the fighting.
During World War I, Sweden attempted to remain neutral and to assert its right to trade with the belligerent countries.
Continental European bourses, which had bounced even higher than those in the belligerent countries, also suffered more in the fall.
In no other belligerent country were political conflicts waged as intensely during the war as in Russia, preventing the effective mobilization of the rear.
Since, South Korea has been the most belligerent anticommunist country (Noe 2008: 204).
No doubt the author felt - and with justice - that only such a rhetoric of hyperbole and bathos could convey the mixture of panic and indifference that is the authentic atmosphere of the belligerent English-speaking countries.
In the face of a belligerent Russia, the country is scarcely any better equipped politically than it is militarily.
When it comes to globalization's rough patches, particularly when America is confronting emerging countries or belligerent would-be superpowers, Mr. Barnett suggests that we need to realize that "we're playing against 'younger' versions of ourselves in many instances".
