Switzerland announced it is strengthening its defense systems against drones to protect military infrastructure following the recent increase in drone and UAV sightings across Europe. The Swiss army has tasked the Federal Office for Defense Procurement with acquiring these systems after successful field tests conducted during the summer, the government reported. Earlier, Denmark's intelligence chief said they are still investigating the drone incident that breached the country's airspace last week. Referring to tensions with Russia, he added that Danish ships have recently been on collision courses with Russian vessels several times.