Chemical weapons expert Hamish de Bretton-Gordon says that a chemical attack on Ukraine would be “very much out of the Russian playbook”. The UK has warned that "all options are on the table" if claims that Russian forces used chemical weapons in an attack on the Ukrainian city of Mariupol are proven to be true. Report by Jonesia. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn