What is the legitimate basis for supplicating for our Muslim brothers in Chechnya and supplicating against their enemies during prayers, and has an explicit Hadith been reported regarding this?

If a calamity befalls Muslims, it is obligatory to support them with all one's might, and if that is not possible, then by supplicating for them and against their enemy. The Prophet, peace and blessings be upon him, used to perform Qunut and supplicate against those who harmed Muslims, and he would supplicate for the salvation of the oppressed among them.