Steven Pifer writes: Russia’s military occupation of Ukrainian territory on the Crimean peninsula constitutes a blatant violation of the commitments that Moscow undertook in the 1994 Budapest Memorandum on Security Assurances for Ukraine. The United States and United Kingdom, the other two signatories, now have an obligation to support Ukraine and penalize Russia.

When the Soviet Union collapsed in 1991, Ukraine found itself holding the world’s third largest nuclear arsenal, including some 1,900 strategic nuclear warheads that had been designed to attack the United States. Working in a trilateral dialogue with Ukrainian and Russian negotiators, American diplomats helped to broker a deal —the January 1994 Trilateral Statement — under which Ukraine agreed to transfer all of the strategic nuclear warheads to Russia for elimination and to dismantle all of the strategic delivery systems on its territory.

Kiev did this on the condition that it receive security guarantees or assurances. The Budapest Memorandum, signed on December 5, 1994, by the leaders of Ukraine, Russia, the United States and the United Kingdom (the latter three being the depositary states of the Non-Proliferation Treaty, that is, the states that receive the accession documents of other countries that join the treaty) laid out a set of assurances for Ukraine. These included commitments to respect Ukraine’s independence, sovereignty and existing borders; to refrain from the threat or use of force against Ukraine’s territorial integrity and independence; and to refrain from economic coercion against Ukraine. [Continue reading…]