Kazakhstan is the second largest country by territory and economy to emerge from the former Soviet Union, but Kazakhstan's energy resources and strong economy give it some independence from Moscow.
Nazarbayev has maneuvered between Russia and the West during more than two decades in power.
Both Obama and Putin have already been in touch with Nazarbayev this month in the wake of the Crimean upheaval. Obama spoke by phone with the Kazakhstan leader on March 10.
The White House said then that Obama urged Nazarbayev to play an active role in seeking a peaceful resolution over the disputed peninsula. Putin spoke to Nazarbayev on March 16, the day of the secession referendum in Crimea.
The Kremlin at the time said both presidents said they were satisfied that the people of Crimea had the opportunity to express their will.
The United States was redoubling efforts to pressure Russia out of its aggressive pose as Obama's four-country, weeklong trip entered its second day.
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