Relations are based on a long shared border and common cultural and historical interactions.

A country can only invade countries with a shared border.

Poland's shared border with the Soviet Union was 1,412 kilometers long.

Afghanistan expressed concerns that the regulation would strengthen militants along its shared border with Pakistan.

Iraqi-Syrian relations have been marked by their long shared border as well as cultural links.

As a result, tensions rose and Iraq and Syria sent troops to their shared border.

Obviously, such a reform requires more effective patrolling of the shared external borders.

Europe has a shared external border, and it is everybody's responsibility.

Both governments blame the other for harboring Taliban militants along the shared border.

Do not forget, either, that my people have been using this tactic defensively against the Klingons, along our shared border, for some years.