Russia and NATO are each building up their military capability across eastern Europe, spurred by the conflict in Ukraine which has prompted officials on both sides to talk of the risk of a new, Cold War-style confrontation.
For Russia, a strategic centerpiece is in Kaliningrad. It is a small piece of Russian territory sandwiched between NATO members Poland and Lithuania, allowing the Kremlin to project its military power into the alliance's northern flank.
During a three-day visit by Reuters earlier this month, there was ample visible evidence of Russia enhancing its military presence.
Trucks moved military equipment from a port to locations inland, small groups of servicemen flew in, work was under way to boost security near one base and extensive construction was taking place at another base housing a military radar system.
The Russian defense ministry did not respond to questions about its deployments in Kaliningrad.
But much of the activity tallied with what military analysts and Western diplomats say Russia is doing: preparing to station new missiles in Kaliningrad and build a web of anti-aircraft systems that could challenge NATO aircraft over the Baltic states and parts of Poland.