Nope, none of that uses symmetric keys >256 bits. Nothing does. The only reason to go >256 bits is if your crypto is getting attacked by an adversary with a Dyson Sphere-sized quantum computer, or an adversary that's found a way around the laws of thermodynamics. Either way, you have big problems.

Of course not - they are free, you don't need to import them.

If you meant "Cisco VPN gateway" then yes, and I wonder if China is actually going to prevent import of cryptography hardware that's known to be broken or backdoored.