This is an argument why governments will resist having it become a reserve currency. Why would you want a reserve currency that you have to have a special set of weapons and a new budget to defend?
The other thing here is that the second the government starts mining with defense budgets every basement miner is just running an expensive heater. All the mining corporations will shut down and we’ll have some form of NATO or OPEC or TPP negotiation the mining which means they’ll be able to enforce sanctions at the drop of a hat.
By this time we’re a bit afield from peer to peer electronic cash.