3906418 Chairman of the Supreme Soviet of the Russian Federation, Boris Yeltsin and President of Kazakhstan, Nursultan Nazarbayev During the Ceremony of Signing the Treaty Between the Russian Federation and Kazakhstan, December 1990.; (add.info.: Chairman of the Supreme Soviet of the Russian Federation, Boris Yeltsin and President of Kazakhstan, Nursultan Nazarbayev During the Ceremony of Signing the Treaty Between the Russian Federation and Kazakhstan, December 1990.); Sovfoto/UIG; EDITORIAL RIGHTS ONLY; out of copyright.