The Kazekage and he had an understanding. The two had spoken in private before and had decided that given their lack of resources yet extremely hardy and ferocious shinobi, it was logical that they form an alliance. Part of this alliance would result in the formation of a combined super-state. The plan called for the wedding of the feudal leadership of both nations to create a new political dynasty. One that would be controlled by them and would last for aeons. Nee-san was not sentimental nor overtly optimistic about the future, but he arrogantly believed that he and Shin could and would usher in a new era. Nee-san had gone through his life believing he knew what was best for everyone and that without his guidance humanity was ultimately doomed. His current mission in the desert was in service of that long-term vision.
They had received intelligence (both telemetric and human) that a Bijuu was operating in the area. The creature had chosen a fairly desolate and isolated portion of the world to roam. It presumably figured that it would be able to escape the attention of man, by moving as far away from civilization as possible. It thought wrong.
Nee-san had a row of scrolls attached to a belt that was draped on the side of the lizard like a bandolier. As the monstrosity marched towards the target, he began to wonder where his ally was. He and Shin had agreed to hunt the Tailed Beast in secret. The sources of the intelligence were scrubbed and manipulated. None of their respective intelligence agencies were permitted to know about this operation. As far as both villages were concerned, the Kazekage and Tsuchikage were engaged in matters entirely unrelated to their present mission.