Rising tensions between Russia and Ukraine have the entire world in a chokehold — but how did this rivalry of neighbors all begin?

In Fox Nation’s new special "Fox Nation 101: The Ukraine Crisis," Russian scholar and former Moscow correspondent David Satter details the history between the two countries beginning with the birth of ancient Russian city Kyiv -- the center of contemporary Ukraine.

But the fall of the Soviet Union centuries later was the ultimate turning point, bringing freedom to Crimea and Ukraine – a nation that had differentiated itself from Russia with European influence and "national feelings," Satter said.

The scholar explained that multiple treaties were signed with Ukraine, all of which validated the existing borders with Russia and Crimea. Meanwhile, the communist governments of former Eastern European satellite countries were overthrown and granted independence, including East Germany which was reunited with the west at the destruction of the Berlin Wall.

FILE - In this Friday, Nov. 10, 1989 file photo, hundreds of Berliners climb on top of the Berlin Wall at Brandenburg Gate in Berlin, demanding in a peaceful protest that the wall will be pulled down. (AP Photo/File)

FILE - In this Friday, Nov. 10, 1989 file photo, hundreds of Berliners climb on top of the Berlin Wall at Brandenburg Gate in Berlin, demanding in a peaceful protest that the wall will be pulled down. (AP Photo/File)

The countries in the belt between Germany and Russia soon recognized their need to join NATO, Satter said, as they stood vulnerable if Russia were to regain power again.

"Russia objected but the United States insisted that any country is free to join NATO," he said. "That it’s a decision to be made by that country itself."

But, according to Satter, Russia was insistent about Ukraine not joining NATO and would consider it a "provocation" if the union were to take place. 

NATO allies began to back off from encouraging Ukraine and Georgia to join and even declined to extend an invitation to both countries at the Bucharest Summit in 2008.

Members of Ukraine's Territorial Defense Forces, volunteer military units of the Armed Forces, train in a city park in Kyiv, Ukraine, Saturday, Jan. 22, 2022. Dozens of civilians have been joining Ukraine's army reserves in recent weeks amid fears about Russian invasion. (AP Photo/Efrem Lukatsky)

Members of Ukraine's Territorial Defense Forces, volunteer military units of the Armed Forces, train in a city park in Kyiv, Ukraine, Saturday, Jan. 22, 2022. Dozens of civilians have been joining Ukraine's army reserves in recent weeks amid fears about Russian invasion. (AP Photo/Efrem Lukatsky)

"This was, to a certain extent, a reaction to Russian pressure - but the Russians reacted almost immediately with an invasion of Georgia," he said. "Which could be interpreted to be a demonstration that NATO made a mistake by not establishing a strong position that it would protect these countries against external aggression."

Since then, there have been no efforts to recruit Ukraine or Georgia as NATO members; only efforts to uphold friendly relations with the United States. Satter explained that extending membership to Ukraine could be a possibility in the future, but "nothing more."

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"And, in fact, nothing has changed recently," he said. "There was no move, whatever to make Ukraine a member of NATO at the time that Putin began making his threats."

Presently, Russia has built up its military at the Ukrainian border and has prepared necessary equipment for invasion. Even though the Ukrainians are determined to resist, if necessary, Putin’s position to launch a war is "unpredictable," Satter said.

Russian President Vladimir Putin attends a video call of the VTB Capital "Russia Calling!" Investment Forum in Moscow, Russia, Tuesday, Nov. 30, 2021. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)

Russian President Vladimir Putin attends a video call of the VTB Capital "Russia Calling!" Investment Forum in Moscow, Russia, Tuesday, Nov. 30, 2021. (Mikhail Metzel, Sputnik, Kremlin Pool Photo via AP)

"I think this is an opportunity that Putin is seizing. I think he feels that he can intimidate the U.S. and NATO, that he can extract concessions, that he can intimidate the Ukrainians, and that he can demonstrate that he's in charge to the Russian people," he said. "Anything that seems to show that Russia is a great power."

To learn more about the history of the Russia-Ukraine conflict, subscribe to Fox Nation and watch  "Fox Nation 101: Ukraine Crisis" today.

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