United States mengungumumkan halt to all military cooperation with Moscow following Russia's operations in Ukraine .
Meeting of the United States and Russia to discuss trade and investment also related developments in Ukraine postponed .
President Barack Obama is considering further measures to isolate Russia , including sanctions in the banking , asset freeze and visa ban .
U.S. Secretary of State , John Kerry , in contrast to the Ukrainian capital Kiev to provide support to the new leadership of Ukraine .
Russian troops - an estimated 16,000 personnel - were reported to be on the Crimean Peninsula .
Military exercises on the border
Meanwhile , the deposed President of Ukraine Viktor Yanukoych asks Russia to send troops to the border to protect civilians , according to Russia's UN envoy .
Vitaly Churkin told a UN Security Council meeting that Yanukovych wrote a letter to President Vladimir Putin on Saturday.
Thousands of Russian troops deployed to the area of Crimea , Ukraine .
Russian forces also conducted military exercises near the border with Ukraine , but Putin then ordered the troops back to base , the Kremlin said .
Ukraine says Russian troops set a deadline to force them to surrender at 03:00 GMT (10:00 BST ) . So far there have been no reports of any incidents .
But Russia denied giving an ultimatum .
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