A buying spree by a Chinese insurance company that has emerged seemingly overnight is flashing a warning sign.

An alliance led by the Chinese company, the Anbang Insurance Group, has for the moment been outbid for Starwood Hotels & Resorts, the owner of the Sheraton and Westin brands, by Marriott International. But that Anbang is even in the running — and may yet win out — is an indication of deal-making gone awry.

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