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Russian President Vladimir Putin (C), accompanied by Defence Minister Sergei Shoigu (L) and Chief of the General Staff Valery Gerasimov (R), watches the joint Zapad-2017 (West-2017) Russian military exercises with Belarus at the Luzhsky training ground in the Leningrad region on September 18, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV        (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)
Russian President Vladimir Putin (C), accompanied by Defence Minister Sergei Shoigu (L) and Chief of the General Staff Valery Gerasimov (R), watches the joint Zapad-2017 (West-2017) Russian military exercises with Belarus at the Luzhsky training ground in the Leningrad region on September 18, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV        (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)

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    Putin oversees large-scale military drills

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Putin oversees large-scale military drills

The US and NATO allies are expressing concern over Russia staging large-scale exercises with Belarus along the borders of three NATO allies -- Latvia, Lithuania and Estonia. CNN's Frederik Pleitgen reports.

Putin oversees large-scale military drills

The US and NATO allies are expressing concern over Russia staging large-scale exercises with Belarus along the borders of three NATO allies -- Latvia, Lithuania and Estonia. CNN's Frederik Pleitgen reports.