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The first story on our last show of the week plays out between Northern and Eastern Europe. In a part of Russia called Kaliningrad, satellite imagery, shared exclusively with CNN, indicates that Russia is on the move, appearing to upgrade four of its military installations in Kaliningrad. This is significant because this Russian region is said to be on the doorstep of NATO, the North Atlantic Treaty Organization. And that's why NATO members are concerned about Russia's action there.

UNIDENTIFIED MALE: What is NATO? Why is it important? And what's its future? The North Atlantic Treaty Organization is a political and military alliance, established in 1949, that seeks to promote to stability in the North Atlantic area.

UNIDENTIFIED MALE: It is a will of the people of the world for our freedom and for our peace.

UNIDENTIFIED MALE: Led by Secretary General Jens Stoltenberg, there are 29 member countries, and it's HQ is in Brussels. NATO doesn't have its own troops, but relies on contributions of forces from its member countries. At NATO's core is Article 5, which states, an attack on one member is an attack on all NATO allies.

The collective defense¹ principle was to protect Western European nations against the Soviet² Union, but when the Soviet Union collapsed³, NATO's new tasks ranged from being a bulwark⁴ against Al-Qaeda in Afghanistan to fighting human trafficking, and intercepting⁵ refuges in the Mediterranean⁶.

NATO is still extremely active, with some 4,000 U.S. troops in Poland and the Baltic states, and tens of thousands on 48-hour standby, bolstering⁷ NATO's allies and sending a clear message to Russia.

AZUZ: Now we said Kaliningrad was on the doorstep of NATO. This Russia region is actually separated from mainland Russia. That what makes it an exclave, a territory surrounded by other countries, and in this case, those nations include Lithuania and Poland.

Both of them are members of NATO. So if Russia appears to be fortifying⁸ its military in Kaliningrad, which the country has pointed⁹ out it has the right to do, you can see why it would raise concerns among NATO allies.

They're currently conducting military exercises in their own show of strength.