Short answer. Yes and no. A Christian cannot be demonically possessed, but a Christian can absolutely be demonically oppressed. They are different. Possession deals with ownership. Christians belong to the Holy Spirit, not any demon. On the other hand, our souls, even our health can absolutely be tormented and affected by demons. How do we know this?
“Then should not this woman, a daughter of Abraham, whom Satan has kept bound for eighteen long years, be set free on the Sabbath day from what bound her?” Luke 13:16
If she is a daughter of Abraham, then she is obviously of the household of faith, which means, believers can also be demonically bound.
I myself have been oppressed by spirits of fear, rage and more. But God is faithful! Sometimes a person experiences complete deliverance in an area, sometimes it is a process, layer by layer. Let us continue to put our hope and confidence in Him who loves us.
It would be inconsistent of me as a Bible believing Christian to stand against any nation for war to which I do not fully comprehend when in the Bible Israel invaded many nations as judgement against pagan leadership or Israel was invaded by pagan kings as judgement against their idolatry and disobedience. I have learned the very hard way that there is only one who is omniscient, the I AM. The media is currently making a certain leader look like the enemy. Maybe he is, maybe not. But given the media’s track record for truth, I beg to ask what’s the motive?
I am more inclined to say however, it is vanity to force to know with certainty. Pray for all nations and leaders, especially the one where you reside, for as we can see, corruption always leads to war. If our country reeks with corrupt leaders, then such is the cup that we shall drink from unless the Lord shows us even more mercy.
I would like to end with this:
“Surely you know, for you were already born! You have lived so many years!” Job 38:21