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Harrow said..Macroscien said..
Lets imagine that
by Year 2050, all military's personnel will be refused entry visas to
peace loving countries !!!

Likewise now you could refuse to convicted pedophile or drug dealer in the future anybody with job description : military will be refused to travel and entry .
That should be good enough too to discourage people around the world to look for career in people killing business.
If you extend that banning entry of hostile ground vehicles, planes, boats, and missiles, you'll be on a winner!
You pretty much solved the problem. You are right !
Sending those items onto somebody else territory without their permission should be strictly forbidden.

Lets imagine such hypothetical scenario:
There is small country that declared to the UN that have NO enemies, territorial claims or disputes
then give up ALL
MILITARY EQUPMENY AND PERSONELin exchange of United Nation
SAFETY GUARANTIES that no one is allowed to attack or intrude this country.
United Nation consider carefully application
and sign commitment to provide security,
if no objections are made from any UN members nation.
Now , if somebody is going to invade or intrude this country
needs to fight
United Nation Peace Force Enforcement -
provided by all participants from whole world .
But there is one more trick
before it could ever happen
United Nation need to move their headquarter to safe neutral land.
Any small Island nation could that could provide un obstructed access to all nation ions on Earth,
by sea and air or land.
Current location at LION DEM is not helping.