The 1994 Budapest Memorandum on Security Assurances was signed by then-Ukrainian President Leonid Kuchma, Bill Clinton, Boris Yeltsin, and John Major. The agreement required that the signatories “respect the independence and sovereignty and the existing borders of Ukraine” and “refrain from the threat or use of force against the territorial integrity or political independence of Ukraine.”<ref>http://www.cfr.org/arms-control-disarmament-and-nonproliferation/budapest-memorandums-security-assurances-1994/p32484</ref> Under the agreement, Russia agreed that Crimea was a part of Ukraine. However, Russia and Crimea also signed a lease allowing Russia to retain existing Soviet naval bases for a finite time period. | The 1994 Budapest Memorandum on Security Assurances was signed by then-Ukrainian President Leonid Kuchma, Bill Clinton, Boris Yeltsin, and John Major. The agreement required that the signatories “respect the independence and sovereignty and the existing borders of Ukraine” and “refrain from the threat or use of force against the territorial integrity or political independence of Ukraine.”<ref>http://www.cfr.org/arms-control-disarmament-and-nonproliferation/budapest-memorandums-security-assurances-1994/p32484</ref> Under the agreement, Russia agreed that Crimea was a part of Ukraine. However, Russia and Crimea also signed a lease allowing Russia to retain existing Soviet naval bases for a finite time period. |