[Symbiote]

There's a list: https://en.wikipedia.org/wiki/List_of_organizations_with_.in...

I don't see why a non-western military alliance wouldn't be eligible, so long as the meet the criteria — treaty registered with the UN etc.

[ViscountPenguin]

Even if they dejure meet the requirements, I suspect that IANA would be under heavy political pressure to deny the claim.

[walletdrainer]

I suspect that exactly no-one cares about .int domains