The article below explains the surrender of nuclear weapons by Ukraine in detail. In 1991 Ukraine had the third largest number of nuclear weapons. By 1996 they had returned all the nukes to Russia in exchange for assurances of economic and military aid. Hah!! In 1991 Bush 1 was president and left office in 1993 when Clinton entered the presidency. It looks like the disarming process started under Bush 1 and was completed under Clinton. Therefore, Obama had absolutely nothing to do with this. Yes, our minds do play tricks on us. At 81 my memory is not what it once was. Thanks we now have Google memory.
https://www.armscontrol.org/factsheets/Ukraine-Nuclear-Weapons
Thanks for the assist. So Russia did not invade Crimea while Obama was President?