Well, your bitcoin would be inaccesible since bitcoin requires internet and a mobile phone. You could no longer exchange it for goods and services or physical currencies. The only thing you can do is to move out to another country where there is no conflict in order for you to survive, or just seek some help.
For our daily living we still need fiat. Bitcoin can help in a way that you don't have to carry any cash with you in war zone region. But even if you migrate to other country than converting btc to Fiat will be difficult as you don't have banking facility available in country where you taking asylum.
Bitcoin has its pros and cons in war situation. If you just wanna move your assets to safe location unless the conflict is over then bitcoin is ideal.