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It is understood that President Obama will still attend the G20 meeting in Saint Petersburg.
Foreign and defence ministers from Russia and Italy have met in Rome to discuss global security.
The US leader was set to meet Russian President Vladimir Putin ahead of the G20 Summit.
Moscow is concerned that the withdrawal of foreign troops could undercut Afghanistan's security situation.
The United Nations estimates that about 100,000 people have been killed in Syria since the start of the conflict.
Snowden's lawyer said the whistleblower had received the necessary papers to enter Russian territory.
Analysts believe the initiative should have been introduced long before Russia joined the trade organisation.
In recent months, Russia and Japan have stepped up high-level talks between the two sides to find a resolution.
The 20-day joint military drill with Russian forces is the second joint exercises scheduled for this summer.
Georgia has long been the ‘pivot of geopolitical rivalry’ between the West and Russia.