Belarus, Poland, Russia, Ukraine
This set has existed since the 1991 Dissolution of the Soviet Union.
The Russian Kaliningrad Oblast, an exclave on the Baltic Sea, creates a Russian border with Poland.
| Borders (km) | ||||
|---|---|---|---|---|
| Belarus | - | 407 | 959 | 891 |
| Poland | 407 | - | 227 | 428 |
| Russia | 959 | 227 | - | 1576 |
| Ukraine | 891 | 428 | 1576 | - |
Read more about this topic: List Of Sets Of Four Countries That Border One Another, Eastern Europe