How to prepare for war financially?

China, Iran, Russia seems to be a nascent axis power. It looks more than saber rattling. I would go further and say that there's cold war vibes.

How should one prepare for war financially ?

1. Liquidate investment accounts into high yield savings accounts?

   1. Could robo investing firms like Wealthfront impose capital controls?

2. Load up on defense and oil stocks?

3. Buy Gold ?