Moscow Oblast is a federal subject of Russia. With a population of 8,524,665 living in an area of 44,300 square kilometers (17,100 sq mi), it is one of the most densely populated regions in the country and is the second most populous federal subject. The oblast has no official administrative center; its public authorities are located in Moscow and Krasnogorsk, and also across other locations in the oblast.

Tula Oblast is a federal subject of Russia. It is geographically located in European Russia and is administratively part of the Central Federal District, covering an area of 25,700 square kilometers (9,900 sq mi). It has a population of 1,553,925 (2010 Russian census). Tula is the largest city and the administrative center of the oblast.