In addition, Beglov supervised the construction of structures in different regions of Russia in the aftermath of the 1988 earthquake in Armenia.

The company had partnerships with the Committee on Foreign Economic Relations of St. Petersburg, which was headed by Vladimir Putin (at the same time, "Melazel" was re-registered as "Olympia-2000").

According to media reports, Beglov acted as co-founder of the Aero Record, Ecotech and Baltikstroy enterprises, the Styk production and transport company, and the Business Partner publishing house.

In 1994 he defended his thesis on the topic "Stability of reinforced concrete elements from the plane of bending", candidate of technical sciences.

From 1997 to 1999 he was a Senior Researcher at the Department of Theoretical Mechanics, doctoral student Saint-Petersburg State University of Architecture and Civil Engineering.

He initiated the reconstruction of Freedom Square in Sestroretsk, monuments to Peter the Great and to the designer of the standard-issue 30 caliber rifle, Sergei Ivanovich Mosin, as well as the fountain "Girl with a fish".

According to observers, this appointment was a compromise by the governor of the city Vladimir Yakovlev and the plenipotentiary representative of the Russian president in the North-West Federal District (NWFD), Viktor Cherkesov.

It was alleged that Sergei Sviridov, deputy plenipotentiary representative for cadres, advanced Beglov's nomination.

[4] In June 2011 Beglov was considered as the main candidate for governor of St. Petersburg, after Valentina Matvienko left for work in Federation Council.

He clashed with Wagner Group head Yevgeniy Prigozhin in November 2022, when his officials refused a permit for an office in Saint Petersburg.

Prigozhin accused Beglov of "financially supporting Ukrainian nationalists” and "betraying Russia" and demanded his resignation as governor.

[13] In response to the 2022 Russian invasion of Ukraine, on 6 April 2022 the Office of Foreign Assets Control of the United States Department of the Treasury added Beglov to its list of persons sanctioned pursuant to Executive Order 14024.