Yanchevski was born in Barysau, Minsk Region. He graduated from the Law Faculty and the International Relations Faculty of the Belarusian State University. In 1994 Yanchevski worked at the presidential campaign of Alexander Lukashenko. In 1995, he was member of the election staff of Stanislau Shushkevich at the Belarusian parliamentary election.[1] In mid-1990s he was member of the Belarusian Russian nationalist political party Slavic Union 'White Rus'.[1] [2]s In 1996-1997 he was First Secretary of the Central Committee of the Belarusian Patriotic Youth Union, the pro-government youth organization. In 2000 Yanchevski became a member of the National Assembly of Belarus following controversial parliamentary elections which were not accepted by the OSCE as free and fair.[3] His term ended in 2004. Between 2005 and 2007 Yanchevski worked as chief editor of an international politics magazine published by Beltransgaz. In April 2008, Yanchevski was appointed advisor on ideology to president Lukashenko and head of the state ideology department of the Presidential Administration of Belarus. In 2013, Yanchevski was appointed Chairman of the Supervisory Board of the Belarus High Technologies Park. In March 2017, he also became Director of the Administration of the Belarus High Technologies Park.

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