From the Russian Wikipedia page 
Pervomaiskoye settlement is a settlement (municipality and administrative unit) within the Troitsky administrative district of the city of Moscow .
It was formed during the municipal reform in 2005, it included 28 settlements later on the abolished Pervomaisky rural district. According to the project of expansion of the territory of Moscow, from July 1, 2012 it was included in the city.
The administrative center and the largest settlement is the village of Ptichnoe.
The Pervomaisky Village Council was formed in 1929 as part of the Krasno-Pakhorsky District (1946-1957 - Kalininsky District) of the newly formed Moscow Region by merging the Ivanovo and Milyukovsky Village Soviets of the former Demen Volost of the Podolsk District of the Moscow Province