Russian Drone Crosses Into Poland, Is Shot Down Over Ukraine.

Ukraine said it spotted a Russian surveillance drone crossing into neighboring Poland before reentering Ukrainian air space, where it was shot down, Ukraine’s military said.

The sighting was the latest indication of the war entering the airspace of a member of the North Atlantic Treaty Organization.

The Russian drone appeared to be surveilling the Ukrainian military training center that was hit in a Russian missile attack on Sunday, the Ukraine air force said in a statement overnight.

The Sunday attack, about 10 miles from the Polish border, drew warnings from NATO members that the alliance would respond with force to any strike on Poland.

A drone suspected to be of Ukrainian origin crashed last week in Croatia--a NATO member. French military surveillance of Croatian airspace found nothing suspicious, the French military said.