Russia assembles troops alongside the Ukraine border 

The USA warns Russia!

What are these headlines? And what is the story behind it? 

To know more, listen to this episode of I don't know with Samantha George 

Reference - 

Information: 

Why Did the Soviet Union Collapse? | Britannica

Ukraine crisis: Why now? What's the history? What are Putin's motivations? | Euronews

Ukraine and Russia explained in maps and charts | Infographic News | Al Jazeera

Ukraine - Wikipedia