Mikhail Gorbachev major campaign to limit alcohol consumption, which Gorbachev—who believed it would improve health and work efficiency—oversaw. His wife keenly supported the measure. As a result, crime rates fell and life expectancy grew slightly between 1986 and 1987. The reform had significant costs to the Soviet economy, resulting in losses of up to $100 billion between 1985 and 1990. Gorbachev later considered the campaign to have been an error. In April 1986 the Chernobyl disaster occurred; in the immediate aftermath, officials fed Gorbachev incorrect information to downplay the incident. As the scale of the disaster became apparent, 336,000 people were evacuated
Mikhail Gorbachev the Alma-Ata Protocol which formally established the CIS. They also preemptively accepted Gorbachev's resignation. When Gorbachev learned what had transpired, he told CBS that he would resign as soon as he saw that the CIS was indeed a reality. On the night of 25 December, in a nationally televised speech, Gorbachev announced his resignation as president—as he put it, "I hereby discontinue my activities at the post of President of the Union of Soviet Socialist Republics." He declared the office extinct and handed over its functions—including control of the Soviet nuclear codes—to Yeltsin. That same night after he left office,