For a review of this sad situation, see: http://www.bbc.co.uk/newsround/20436092 This is not a perfect review, I'm sure, and has been revised for balance after complaints, but it is a short summary of the events since the late 1940s.
Pope Francis has made news recently for calling for an end to all war. I agree with him. We must find a way to free ourselves from our basest, most violent ways and become peacemakers and protectors of each other and our world. My denomination, American Baptist Churches, USA, has a treatise written in the 1980s deliniating our stance on peace, and it is a good one for your consideration. You'll find it at: http://www.abc-usa.org/wp-content/uploads/2012/06/peace.pdf The document was last modified in 2007, so the thinking remains recent.
Praying and working for peace. Perhaps we could find a way to do this instead: http://jsbrookspresents.blogspot.com/2014/07/looking-to-love.html