1. More soldiers
2. Fewer consumers
3. Fewer workers
4. GOTO 1

Each sanction needs to be spelled out, discussed, and voted.

Countries have a lot of complex relationships between them, sanctioned countries find new ways to circumvent some… so it’s not possible to “do all the sanctions” at once, not for the existing relationships, and definitely not for all circumvention methods a country might come up with in the future.

Then, there are underlying interests, like in sanctioning Gazprom along with most banks… but waiting over two years to sanction Gazpombank, which was still being used to buy gas from Russia.