This question is difficult to answer, as well as the question about diseases or other misfortunes. But, of course, such events are a strong call for repentance, a reassessment of your life.
God is the master of history. We must remember this. Especially today, when there is a war. May I ask, what did the prayers for peace brought all over the world give? It is difficult to understand why the Lord God allowed this war. Who has recognized the thoughts of the Lord?
My thoughts are not your thoughts and not your ways (IS 55,8).