>>16698520particle accelerator
they could build tunnels to the core of the earth, then to the surface of the countries they want to do. with a way to navigate those tunnels (send particles to the desired result, maybe by using affinity to the end of the tunnel), they could nuke any country they wanted with fast particles/projectiles. though it might seem unlikely to ever happen at first, remember that gravity is stronger underground the closer you are to the core
>>16698520 so any nukes sent without an affinity > activation of a tunnel would spin around the core, speeding up, to either spin into the wall or cross the activation threshold to go - which may be beneficial