Russia has labelled Kremlin critic Mikhail Khodorkovsky and former world chess champion Garry Kasparov "foreign agents," a designation Moscow has previously applied to individuals and organizations who oppose the government.
The two were added to a list maintained by the Justice Ministry, TASS state news agency reported on Friday evening, claiming both were involved in political activities and were receiving funding from Kiev and Washington.
The Russian authorities have increasingly classified non-governmental organizations and media as "foreign agents," a label that brings with it considerable difficulties in Russia.
The step comes after Kasparov recently criticized Russian President Vladimir Putin for the war against Ukraine.
Meanwhile the Russian authorities have repeatedly targeted the organizations run by exiled Kremlin critic and ex-oil magnate Khodorkovsky.
Last summer, the Russian judiciary classified the Britain-registered Khodorkovsky Foundation as "undesirable," effectively placing a ban on all its activities.