As Russian troops take part in what may be the largest military exercise since the Cold War, NATO has called on Moscow to be more "transparent" about its exercises.
The Zapad 2017 military exercise is held on the border with Poland, Lithuania and Belarus. The main purpose is to stimulate defense and counterattack in case of war with NATO member countries. The last time Russian President Vladimir Putin sent troops to Belarus a new war erupted.
Speaking exclusively to CNBC on Thursday, Jens Stoltenberg, Secretary General of NATO, called on Russia to be "transparent" about its military exercises to avoid any "misunderstandings or miscalculations."
"Every nation, also Russia, has the right to exercise its forces but it's important this is done in a transparent way to prevent misunderstandings, miscalculations," he said.
"And we've seen before, Russia using military exercises as a disguise for aggressive actions against other countries; that was the case in 2008 and that was the case in 2014 when they annexed Crimea," Stoltenberg said.