Reuters reported on Monday that Valentin Yumashev, the son-in-law of former Russian President Boris Yeltsin, had resigned from his job as a Kremlin adviser.
He is the most recent of a number of important Russian officials to resign since Putin launched his invasion of Ukraine 100 days ago.
According to two sources close to the matter, Yumashev, who was characterized as a significant factor in the ascent to power of Russian President Vladimir Putin, resigned from his position in April.
Lyudmila Telen, the first deputy executive director of the Boris Yeltsin Presidential Center, where Yumashev serves on the board of trustees, Yumashev resigned last month. She further claimed that Yumashev's departure was his own decision.
Yumashev worked in an unpaid capacity and had "little impact on Putin's decision-making," Reports have it that his name recognition, historical prominence, and link to Yeltsin make his resignation a significant blow to the Kremlin.
A second source with knowledge of the issue spoke to Reuters on the condition of anonymity. The same source disclosed that Yumashev resigned from his position as presidential adviser in April.
There has been no reason for Yumashev's departure, but his daughter wrote an anti-war statement with a Ukrainian flag on Instagram on February 24 - the day Putin's soldiers began attacking Ukraine.
Yumashev is married to Tatyana, the younger daughter of Boris Yeltsin, and was once an aide to his since-departed father-in-law.
In a report by BBC, while serving as Yeltsin's chief of staff in 1997, Yumashev handed Putin his first position in the Kremlin. He is reported to have afterwards suggested to Yeltsin that Putin succeed him.
Since Russia began its invasion of the Ukraine, additional senior Russian officials have resigned from their positions.
In its report, the Associated Press said one of the most influential was Anatoly Chubais, a longstanding government official who served as Putin's envoy to international groups concerned with sustainable development.
Boris Bondarev, the Russian diplomat to the United Nations, quit his post on May 23 because of Russia's invasion of Ukraine. Bondarev remarked in a letter to other diplomats, "I have never been more ashamed of my country as I was on February 24 of this year."
AP stated that Arkady Dvorkovich, a former Russian deputy prime minister, also stepped down as chairman of the Skolkovo Foundation, a leading state-sponsored science institution, after the war in Ukraine broke out.
