Four Chinese workers were killed and five others injured Sunday in a fire that engulfed a wood factory in Russia's Far Eastern city of Zima.The fire broke out in a makeshift wooden shelter of the China-Russia joint venture, which housed 33 Chinese workers, and spread to an area of 300 square meters, said Chinese Consul General in Irkutsk Guo Zhijun.Investigators said the four dead were male, but their identities had yet to be determined.