Add Yahoo as a preferred source to see more of our stories on Google. On 10 September, Russian drones over Polish airspace prompted Radoslaw Sikorski to invoke Article 4 of Nato’s North Atlantic ...

Poland suggested such a zone after a major Russian incursion. But political hesitance and military shortcomings pose clear obstacles. By Marc Santora Reporting from Kyiv, Ukraine After recent ...

The sky is a wide-open expanse of seemingly endless open air. But even thousands of feet above the ground, there are still rules that must be followed. Planes can't simply fly wherever they wish.

As Russia’s military action in Ukraine encroaches on European airspace, Poland’s foreign minister has raised the prospect of Nato support in patrolling the skies. On 10 September, Russian drones over ...