Ronald Reagan explained his strategy was an arms buildup that would leave the Soviets far behind, with no choice but to negotiate arms reduction. Finally, displaying his characteristic optimism, he praised liberal democracy and promised that such a system eventually would triumph over Soviet communism. Reagan appreciated the revolutionary change in the direction of the Soviet policy with Mikhail Gorbachev, and shifted to diplomacy, with a view to encourage the Soviet leader to pursue substantial arms agreements. He and Gorbachev held four summit conferences between 1985 and 1988: the first in Geneva, Switzerland, the second in Reykjavík, Iceland, the third in Washington,
Nancy Reagan failed to include some $3 million worth of fashion items between 1983 and 1988 on their tax returns; they were billed for a large amount of back taxes and interest, which was subsequently paid. After President Reagan revealed that he had been diagnosed with Alzheimer's disease in 1994, she made herself his primary caregiver, and became actively involved with the National Alzheimer's Association and its affiliate, the Ronald and Nancy Reagan Research Institute in Chicago, Illinois. In April 1997, Nancy Reagan joined President Bill Clinton and former Presidents Ford and Bush in signing the Summit Declaration of Commitment in advocating