By Andrew Osborn

MOSCOW (Reuters) -Vladimir Putin is set to become the first Russian president to visit Alaska, a territory Moscow sold to the U.S. in 1867 for $7.2 million, assuming a summit with U.S. President Donald Trump goes ahead there on Friday as planned.

It would be Putin's eighth trip to the U.S. as president, a post he has held since the end of 1999 apart from a four-year hiatus in 2008-2012 when close ally Dmitry Medvedev held the top Kremlin job.

Here are details of Putin's previous visits to the United States as president, and a summary of those made by Medvedev and Boris Yeltsin, his predecessor.

2015 - The last time Putin was in the U.S. he visited New York for the United Nations General Assembly and held talks with then-President Barack Obama. The encounter was a frost

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