ZITTAU, Germany — European leaders celebrated Friday as the borders of nine countries along a Cold War frontier melted away, allowing a huge expansion to the EU’s passport-free travel zone.

The eastern border of Europe goes through the Russian Empire, along the Ural mountains, through the Caspian Sea, and through Transcaucasia.

The concept of a "drone wall" isn't new, but its exact form along the eastern flank of NATO remains unclear. Lithuania's then ...

Five out of six countries along the border with Russia and Belarus plan to secure their borders with land mines, aiming to protect NATO's eastern flank from a possible attack. But the plan is highly ...

Nine new European Union countries recently became part of an agreement in which citizens of these countries can travel from the European Union's easternmost edges all the way across Portugal and ...

Europe has lacked the political will to enact significant sanctions on Russia, mostly because the E.U. relies on Moscow for energy. As they hesitate, the borders of Eastern Europe are being redrawn .

In recent days, senior Western officials have expressed their concern at the thousands of Russian forces that have appeared near the eastern borders of Ukraine. CNN values your feedback 1.

U.S. troops to head to Eastern Europe as Russia masses forces on Ukraine's border Pentagon press secretary John Kirby announced Wednesday that thousands of U.S. troops will be sent to Eastern Europe.

In the middle of Poland's Bialowieza Forest, one of Europe's oldest remaining forests, stands Europe's newest border wall: a 15-foot-high metal fence topped with razor wire and security cameras ...

Leaders confronted with a migration crisis have a stark choice: They can either cover the political and financial costs to stop the flow of people at the source or pay the bill when they arrive.

In recent days, senior Western officials have expressed their concern at the thousands of Russian forces that have appeared near the eastern borders of Ukraine. CNN values your feedback 1.