Ukraine asked Western nations to provide any evidence they may have to help investigators probing a Ukrainian passenger plane that crashed in Iran, as US media reported it was mistakenly shot down by a missile. "Our country has every interest in establishing the truth. That is why we are calling on Ukraine's Western partners: If you have evidence to assist the inquiry, we call on you to provide it," the Ukraine presidency said in a statement. ant/mp/fjb/klm/har