The competition would be keen, very keen!
One day not too far away from today, perhaps these extremely advanced arms exporters would be quite willing to export their very Least Advanced arms that could still be good enough to destroy our entire earth after any one of the aggressive importers initiating the destroying process through pressing their arms' buttons by their supreme leaders!
Suggestion: The 4 entities US/EU/China/Russia should form a World peace keeping force, just like police force, in order to defend our earth from any approaching asteroids, or UFOs.
All other countries should financially contribute peace keeping fees to be shared by these 4 entities as coordinated by the UN.
How many countries would allow their police force or arms manufacturers to sell their Least Advanced arms to any gangs or remote villages after the arms becoming less powerful? lol