President Ronald Reagan, right, and Soviet leader Mikhail Gorbachev exchange pens during the Intermediate-Range Nuclear Forces Treaty signing ceremony in the White House East Room on December 8, 1987. Gorbachev’s translator Pavel Palazhchenko stands in the middle.

President Ronald Reagan, right, and Soviet leader Mikhail Gorbachev exchange pens during the Intermediate-Range Nuclear Forces Treaty signing ceremony in the White House East Room on December 8, 1987. Gorbachev’s translator Pavel Palazhchenko stands in the middle.