I also like the strategy of buying assets on negative geopolitical news, but I have noticed that sometimes this strategy leads to having to wait quite a long time for the asset price to recover, even to the purchase level, let alone to the levels where you can close the deal and make a profit. So, you need to be careful with this strategy, or only invest funds that you can temporarily forget about if the situation in the geopolitical arena worsens.
It's usually a short-term effect, and it shouldn't be considered as a "signal" to buy - but it can be interpreted as one, for sure.
Especially for those who look at a picture of the chart on a non-monthly / bigger scale.