Is a simple analogy, if there is war, there will definitely be panic in the economy and people will be rushing to sell off the Bitcoin either to buy other things that they need or selling out of fear that the Price will drop because of the war, so for that during whatever war, there is always a market high volatilities because of the fuds that comes along with war.
The thing that makes volatility high in a war is when infrastructures getting destroyed and it causes shortage in commodity or energies.
It's like when the oil refineries were destroyed, oil price spike and people cashing out from bitcoin to rotate hoping to get profit.
Nowadays it's not as impactful though because people also understand that bitcoin is one way to save their wealth.