Tianjin and Moscow Oblast are friendly associated on May, 17th, in 1993.

Moscow Oblast is a federal subject of Russia. Its area, at 45,900 km², is relatively small comparing to other federal subjects, but it is one of the most densely populated regions in the country and the second most populous federal subject (population 6,618,538 as of the 2002 Census)—only surpassed by the federal city of Moscow which, although an enclave of the Oblast, is a separate federal subject.

Moscow Oblast is highly industrialized with its main industrial branches being metallurgy, oil refining, and mechanical engineering, food, energy and chemical industries.Moscow oblast borders Tver Oblast (N), Yaroslavl Oblast (at one point NE), Vladimir Oblast (E), Ryazan Oblast (SE), Tula Oblast (S), Kaluga Oblast (SW), Smolensk Oblast (W), and the City of Moscow (center), which does not belong to the oblast but is a federal subject in its own right.