Why and how did Ronald Reagan shift his stance toward the Soviet Union during his second term?

Description Essay question: “Why and how did Ronald Reagan shift his stance toward the Soviet Union during his second term?” Suggested secondary sources: – Beth A. Fischer, ‘The Reagan Reversal’ – James Wilson, ‘The Triumph of Improvisation’ Suggested primary sources: – Svetlana Savranskaya, ‘The Last Superpower Summits’ – Ronald Reagan, ‘An American Life’ – Alexander Haig, ‘Caveat: Realism, Reagan, and Foreign Policy’ – Reagan speeches at American Presidency Project: http://www.presidency.ucsb.edu/ Please include a bibliography divided into primary and secondary sources, and have the essay argument be based on primary sources and supported by secondary sources. There must also be a paragraph on the historiography surrounding the topic. I have attached a collection of excerpts curated by my professor on this topic, so feel free to reference anything in that which might be relevant. I have also attached the document outlining the requirements of the essay.