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Group of 15 European republics unite into the Union of Soviet Socialist Republics (USSR)
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During the cold war, the west founded the North Atlantic Treaty Organization (NATO), to combat the Warsaw Pact. This organization still stands today and continues to expand.
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The USSR falls, granting independence to Ukraine and the other nations involved.
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Putin states that Ukraine isn't a true nation state, and should not join NATO.
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Russia seized the Ukrainian peninsula of Crimea.
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Russia deployed troops along the border of Russia and Ukraine for "security" purposes.
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Russia officially invades eastern Ukraine (Donbas)
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Today, Russia has control over multiple eastern cities in Ukraine, and has began moving north.