Russian billionaires German Khan, Andrei Kosogov and Alexei Kuzmichev stepped down from LetterOne's board of directors Monday, days after the European Union imposed sanctions on the investment company's co-owners.

Plenary session of Russian Union of Industrialists and Entrepreneurs congress

Two people resigned from the LetterOne board last week after facing European Union sanctions. Three more billionaires stepped down from the board.

TASS via Getty Images

According to a statement obtained by The Guardian, the three billionaires will resign from their positions at the company immediately.

Though Khan, Kosogov and Kuzmichev avoided the sanctions facing Aven and Fridman, they all made their fortunes thanks to their relationship with Fridman.

Forbes puts Khan's net worth at $8.1 billion, Kosogov's at $1.2 billion and Kuzmichev's at $6.2 billion.

According to the Internet Archive's Wayback Machine, the three no longer appear on the company's board of directors listing.

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The EU froze the assets of Aven, Fridman, and four other Russian billionaires. On Thursday, LetterOne announced the resignations of Aven and Fridman. The head of Alfa Bank, Aven, and the founder of Fridman are among the wealthiest people in Russia. LetterOne says it supports more than 100,000 jobs globally through its investments.

The case of fellow Russian billionaire Roman Abramovich, who said last week he will sell his club, is similar to the case of Khan, Kosogov and Kuzmichev.

Three more Russian billionaires have resigned from a board.

The tracker looked at 16 Russian billionaires who were hit by sanctions.

The Russian Billionaires Fridman, Usmanov, and Timchenko are subject to EU sanctions.