The diplomat said Monday that the June summit will only feature the top seven economies — not Russia — using the format the meetings had during the Cold War.
The diplomat spoke on condition of anonymity ahead of the decision's official announcement in a joint statement.
U.S. President Barack Obama met with his counterparts from the other G-7 nations on the sidelines of a summit on nuclear security in the Netherlands to discuss the group's reaction to Russia's annexation of Crimea.
Russia had invited the G-8 group to a summit in its Black Sea resort Sochi in June.
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