The most important thing is if you live in a country directly affected by the war, surely people would migrate and seek shelter. Bitcoins can be helpful for doing this as you will not be carrying your country's local currency. I am sure now that people would be buying crypto in fear of the war happening.
Of course, it's bitcoin. During such times, all banking buildings will be closed. Their online operational capability can also be affected. So even if you've all the money in the world, you might not access to it. Also, If you've real estate investment, it won't matter. You can't carry it with you and it might be destroyed during the war. The same with gold and silver. However, Bitcoin nature makes it the perfect asset to have. The seed phrase is easy to carry and it can
holdcontain a substantial amount which can be accessed anytime.