July 16, 1990 Ukrainian Rada votes Declaration of State Sovereignty, pledging not to accept, produce or purchase nuclear weapons.
July 31, 1991 U.S. and Soviet Union sign START I Treaty.
August 24, 1991 Ukraine declares independence, subject to a December referendum.
October, 1991 Rada reaffirms its non-nuclear pledge of July, 1990, and commits to getting rid of nuclear weapons but that technical, financial and environmental needs would have to be addressed.
December 1, 1991 Ukrainian referendum overwhelmingly endorses independence. Leonid Kravchuk is elected President.
December 8, 1991 Commonwealth of Independent States (CIS) created by Russia, Ukraine and Belarus.
December 21, 1991 Alma Atay Agreement. The former Soviet nuclear republics agree that nuclear weapons can only be used by agreement by all four. Ukraine, Kazakhstan, and Belarus agree to withdraw tactical weapons to Russia by July 1, 1992.
December 25, 1991 President Gorbachev resigns, bringing an official end to the Soviet Union. U.S. recognizes Ukrainian independence.
December 30, 1991 Ukraine agrees at Minsk Commonwealth summit to dismantle its strategic nuclear forces by the end of 1994.
March 12, 1992 Ukraine suspends shipment of tactical nuclear weapons to Russia.
April 16, 1992 Ukraine and Russia form joint commission to supervise shipment of tactical weapons. Transfers resume.
May 7, 1992 During visit to Washington, President completion of tactical shipments to Russia. Kravchuk announces
May 23, 1992 Ukraine signs Lisbon Protocol making it an official party to the START I Treaty.
August 31, 1992 U.S. and Russia agree to compensation on HEU issue.
October 1, 1992 U.S. ratifies START I Treaty.
October 2, 1992 Undersecretary of State Frank Wisner visits deactivation proposals and security assurances. Kiev to discuss
November 4, 1992 Russia ratifies START I Treaty.
November 17, 1992 U.S.-Ukraine dialogue commences.
January 3, 1993 U.S. and Russia sign START II.
January 26, 1993 Ukraine and Russia begin talks on dismantling and eliminating strategic nuclear warheads.
April, 1993 162 Ukrainian Deputies issue statement declaring Ukraine a nuclear state.
May 9-10, 1993 Ambassador Strobe Talbott visits Kiev to restart U.S.-Ukraine relations.
June 7, 1993 Secretary of Defense Aspin visits Kiev to discuss deactivation.
July 2, 1993 Ukrainian Rada votes that Ukraine has ownership rights to the nuclear weapons. …