Question: Who was the spouse of the president of the Russian republic at the time of the disintegration of the union that signed a 1939 non-aggression pact with Germany?

<P0-S0> Raisa Maximovna Gorbacheva ( "Raisa Maksimovna Gorbachyova", , Титаренко; 5 January 1932 – 20 September 1999) was a Russian activist who was the wife of Soviet leader Mikhail Gorbachev. <P0-S1> She raised funds for the preservation of Russian cultural heritage, fostering of new talent, and treatment programs for children's blood cancer. <SEP> <P1-S0> The Molotov -- Ribbentrop Pact, also known as the Nazi -- Soviet Pact, the German -- Soviet Non-aggression Pact or the Nazi German -- Soviet Pact of Aggression (officially: Treaty of Non-aggression between Germany and the Union of Soviet Socialist Republics), was a neutrality pact between Nazi Germany and the Soviet Union signed in Moscow on 23 August 1939 by foreign ministers Joachim von Ribbentrop and Vyacheslav Molotov, respectively. <P1-S1> The pact was followed by the German - Soviet Commercial Agreement in February 1940. <SEP> <P2-S0> The dissolution of the Soviet Union occurred on December 26, 1991, officially granting self - governing independence to the Republics of the Soviet Union. <P2-S1> On the previous day, 25 December 1991, Soviet President Mikhail Gorbachev, the eighth and final leader of the Soviet Union, resigned, declared his office extinct, and handed over its powers -- including control of the Soviet nuclear missile launching codes -- to Russian President Boris Yeltsin. <P2-S2> It was a result of the declaration number 142 - Н of the Supreme Soviet of the Soviet Union. <P2-S3> The declaration acknowledged the independence of the former Soviet republics and created the Commonwealth of Independent States (CIS), although five of the signatories ratified it much later or did not do so at all. <P2-S4> That evening at 7: 32 p.m., the Soviet flag was lowered from the Kremlin for the last time and replaced with the pre-revolutionary Russian flag. <SEP> <P3-S0> on january 25, 1918 the third meeting of the all-russian congress of soviets renamed the unrecognized state the soviet russian republic. <P3-S1> the treaty of brest-litovsk was signed on march 3, 1918, giving away much of the land of the former russian empire to germany in exchange for peace during the rest of world war i. on july 10, 1918, the russian constitution of 1918 renamed the country the russian socialist federative soviet republic. <P3-S2> by 1918, during the russian civil war, several states within the former russian empire seceded, reducing the size of the country even more. <SEP> <P4-S0> on 23 october 1954 – only nine years after allies (uk, usa and ussr) defeated nazi germany ending world war ii in europe – the admission of the federal republic of germany to the north atlantic pact was finally decided. <P4-S1> the incorporation of west germany into the organization on 9 may 1955 was described as "a decisive turning point in the history of our continent" by halvard lange, foreign affairs minister of norway at the time. <P4-S2> in november 1954, the ussr requested a new european security treaty, in order to make a final attempt to not have a remilitarized west germany potentially opposed to the soviet union, with no success.