Who Can Give Security Guarantees To Ukraine?
A main question for Ukraine since it became an independent state was who or what could potentially guarantee its security.
In the first years after 1991 the Ukrainian government thought that it could secure itself. It had inherited some Soviet nuclear weapons and it tried to bring those to use. But it failed to circumvent the security locks the Russian engineers had integrated into the nuclear warheads.
There was also pressure from the U.S. to get rid of those devices as the Ukraine at that time was prolific in selling its Soviet era weapons to various shady actors around the world.
Ukraine, together with Belarus and Kazakhstan, was pressed to enter the Nuclear Non-Proliferation Treaty.