Amb Matlock:
Here's the context: first of all,when President Herbert Walker Bush met with Gorbachev in Malta, in December 1989, they came to a very important agreement. One was that we're no longer enemies;the second was that the Soviet Union will not intervene in Eastern Europe if there's political change;and the third was the United States will not take advantage of changes there.
https://nsarchive.gwu.edu/document/27385-transcript-ambassador-jack-f-matlock-interview
https://www.history.com/.image/t_share/MTU3ODc3NjU5MTU3NDA3MDQ5/bush-and-gorbachev-declare-end-of-cold-war.jpg
We have been working with Russia to dispose of weapons grade plutonium for YEARS.
https://www.wired.com/2000/09/u-s-russia-sign-plutonium-pact/
On Friday, Vice President Al Gore signed the United States-Russian Federation Agreement on behalf of the United States. The agreement, announced in Moscow in June by U.S. President Bill Clinton and Russian President Vladimir Putin, aims to turn excess weapons-grade plutonium into forms that cannot be used for weapons.