Lu Zhankui was a Mongol officer under the Manchuria based warlord Zhang Zuolin. In 1917, he was responsible for negotiations with the Chinese government on behalf of his Independence Army, the Dulidui. He was instrumental in bringing Onisaburo Deguchi to Mongolia in 1921, but was captured along with Deguchi and executed by firing squad in Tongliao.
References
Lu Zhankui Wikipedia(Text) CC BY-SA