It is "Desert Encounter" by I. Rosokhvatsky, isfdb
Other names: "Aliens from another time", "Newcomers from the next hour", "Meeting in time", "Meeting in the desert".
First published in 1961 (ukrainian version).
Plot
In the middle of the Asian desert, not far from the remains of an ancient city, archaeologists have discovered two strange statues of a man and a woman. The mystery of the statues haunts researchers. According to one of the hypotheses, a spaceship once landed in the desert, and intelligent beings left these statues as a sign of their stay on Earth. The truth is somewhat different...
"Misha" character:
His name was Mikhail Grigorevich Butyagin. When he came here for the first time, they called him "Misha"
Full story at archive.org, english version