By Noor Zainab Hussain and Carolyn Cohn (Reuters) -The threat of war between Russia and Ukraine is the biggest risk for insurers offering coverage during the Beijing Winter Olympics as an outbreak of hostilities could force team withdrawals or appearance cancellations, industry sources say. Olympic Games, top events on the sporting calendar, are always a major business opportunity, and a great headache for the commercial insurance industry. Insurers paid out https://www.reuters.com/business/finance/local-olympics-organisers-face-uninsured-loss-spectator-ban-sources-2021-07-12 hundreds of milli…