Matthew 24:6, NIV. "You will hear of wars and rumours of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come. Nation will rise against nation and kingdom against kingdom.......'
We should be appalled and angry, but not alarmed; because if such things did not happen the Bible would not be true. Nor should we be looking at the news to form our eschatology, for the end is still to come, and the Day of the Lord will come like a thief in the night, while people are saying "peace" and "safety" (1 Thessalonians. 5:1-3). Not too many people saying that at the present time, I think.
As for Putin being any sort of Christian, 'The LORD abhors the bloodthirsty and deceitful man.'