When Ukraine signed the nuclear Non-Proliferation Treaty in 1994, one of Ukraine's conditions was that fellow signatories Russia and the United States would guarantee its territorial integrity. Twenty years later, Russia has annexed Crimea and Kyiv is fighting a Russian-backed separatist insurrection in its eastern region - bordering Russia. What happened over the past two decades?
Euronews: US and Ukraine, history of ups and downs (VIDEO)
Ukrainian President Petro Poroshenko addresses a joint session of the US Congress at the Capitol in Washington, DC, on Sept. 18, 2014.
