Gorbachev's daughter Irina Gorbacheva-Virganskaya and former adviser of ex-Soviet president Gorbachev, head of the Gorbachev Foundation press service, Pavel Palazhchenko pay their respects to Mikhail Gorbachev, the last leader of the Soviet Union, during a memorial service at the Column Hall of the House of Unions in Moscow, Russia. Gorbachev died on Tuesday at the age of 91 in Moscow after a long and serious illness, according to the Central Clinical Hospital.