They are betrayers.
Jesus said, " ...Thus is it written, and thus it behooved Christ to suffer, and to rise again from the dead the third day,
And that repentance, and remission of sins should be preached in his Name among all nations, beginning at Jerusalem."
[Luke 24: 46-47]
If they are Christians, they have to preach the gospels to all nations, instead of conducting invasions.