You can read the fatwa by Sheikh Bin Baz with regards to this issue. I will further PM you any info I find.From the sunnah the Prophet took the help of Abu Thalib who was a non Muslim against those who opposed him. And he had dealings with the Jews up until his death, whereby his armor was mortgaged with one. Taking the help of non Muslims is not haram. It's assisting the enemies against Muslims who are themselves innocent that is haram and considered a form of kufr.