icelandic coast, new evidence that russia is beefing up the activities in the heart of euro europe. cnn has exclusively obtained satellite images seemingly showing massive construction work at russia's bases in kaliningrad, adding new bigger ammunition bunkers and upgrading the military airfield. is vladimir putin building it up? russia's ministry didn't see it. they say there's a pattern of russia upgrading its capabilities in the region. >> they're putting a lot of their anticruise ship missiles in there. >> reporter: sending a message of strength to moscow the u.s. is gearing up for a bigger exercise in norway. >> if they want to challenge us, we're going to challenge them.

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