"The court decided to satisfy the request of the investigation, to elect a preventive measure in the form of detention," RIA Novosti cites the decision of the judge.
Ilyichev will remain in custody until May 25, like the other five defendants in the Abyzov case.
Earlier it became known that Ilyichev was detained in Russia on April 4 after he flew in from Thailand.
It was noted that at first he managed to escape.
Abyzov is charged with creating a criminal community and fraud on a large scale. According to the UK, he kidnapped and brought 4 billion rubles abroad.