KIEV: Ukraine's interim leaders established a new National Guard on Tuesday and appealed to the United States and Britain for assistance against what they called Russian aggression in Crimea under a post-Cold War treaty.
Blaming their ousted predecessors for the weakness of their own armed forces, acting ministers told parliament Ukraine had as few as 6,000 combat-ready infantry and that the air force was outnumbered nearly 100 to 1 by Moscow's superpower forces.
There was no let-up in the war of words, with the pro-Russian regional parliament in Crimea approving a declaration of independence that will take effect if people on the Black Sea peninsula vote to unite with Russia in a referendum on Sunday.
The national parliament in Kiev said it would dissolve the Crimean assembly if it did not cancel the plebiscite.
Viktor Yanukovich, whose overthrow last month after protests triggered the gravest crisis in Europe since the Cold War, insisted from his refuge in Russia that he was still Ukraine's legitimate president and commander of its armed forces.
Acting Prime Minister Arseny Yatseniuk, who will visit the White House and United Nations Security Council this week, said a 1994 treaty under which Ukraine agreed to give up its Soviet nuclear weapons obliged Russia to remove troops from Crimea and also obliged Western powers to defend Ukraine's sovereignty.
He said a failure to protect Ukraine would undermine efforts to persuade Iran or North Korea to forswear nuclear weapons as Kiev did 20 years ago. The terms of the Budapest Memorandum oblige Russia, Britain and the United States as guarantors to seek U.N. help for Ukraine if it faces attack by nuclear weapons.
Parliament passed a resolution calling on the United States and Britain, co-signatories with Russia of that treaty to "fulfill their obligations … and take all possible diplomatic, political, economic and military measures urgently to end the aggression and preserve the independence, sovereignty and existing borders of Ukraine".
NATO powers – and the authorities in Kiev – have made clear they want to avoid a military escalation with Moscow, which has denied its troops are behind the takeover of Crimea 10 days ago by separatist forces – a denial ridiculed by other governments.
The European Union and United States have been preparing sanctions against Russia, though with some reluctance, especially in Europe, which values commercial ties with Moscow.
Direct diplomacy has stalled this week. U.S. Secretary of State John Kerry turned down an invitation to Moscow until Russia modifies its stance. Ukrainian premier Yatsneniuk said he had been unable to reach either Russian President Vladimir Putin or Prime Minister Dmitry Medvedev for the past five days.
Russia says the overthrow of Yanukovich was a coup backed by the West and that it has the right to defend the interests of the ethnic Russian majority in Crimea, a territory of two million that the Kremlin transferred from Russia to Ukraine at a time when the collapse of the Soviet state was unthinkable.
NATO AWACs surveillance planes were beginning flights over Poland and Romania to monitor events in Ukraine and the U.S. navy was preparing for exercises in the Black Sea with NATO allies Bulgaria and Romania over the next few days.
Yatseniuk, who said he supported efforts to set up a "contact group" of major powers to resolve the crisis, accused Russia of seeking to undermine the world security system:
"This is not a two-sided conflict. These are actions by the Russian Federation aimed at undermining the system of global security," he told parliament.