Drone warfare
On October 13, 2022, the first recorded instance of an unarmed drone-on-drone combat encounter occurred above the Donetsk region of Ukraine. A Ukrainian DJI Mavic quadcopter was recorded ramming a Russian drone of the same model, resulting in the latter crashing towards the surface below. Another instance of this aerial ramming tactic occurred on November 24, 2022, this time with the Russian DJI Mavic being recorded plummeting towards the ground after a collision with a Ukrainian drone.
On May 9, 2023, a Russian conscript surrendered to (or rather via) a Ukrainian drone.
The average HESA Shahed 136 drone is worth about $20,000. An IRIS-T missile is worth about $430,000 each in comparison. From 13 September until 17 October, open source information suggests that Ukraine has had to spend $28.14 million on defending against these drones.
Since at least September 2022, Ukraine has used black naval drones, equipped with the Starlink satellite internet system, to carry attacks on the Russian Black Sea fleet at the Sevastopol Naval base. The naval drones were at first assumed to be for reconnaissance, but appear to carry munitions and act as a bomb. With experts noting that the sensors on the front of the naval drone could be used as a laser range finder to help in targeting. In late October 2022, seven of these drones were used to mount a successful drone attack on the Sevastopol Naval base.
In September 2023, Ukrainian troops were reported as using cardboard drones with GoPro cameras for aerial reconnaissance.
As of April 2024, Ukraine has started deploying manned aircraft, such as the Aeroprakt A-22 Foxbat and Yakovlev Yak-52, which uses snipers or machine guns to shot down Russian drones. Ukrainian drones have also been given a variety of improvised modifications for the express purpose of attacking and countering Russian drones; these include an instance in July 2024 where an FPV drone with a stick mounted to it was used to attack and eventually destroy a ZALA 421-16E reconnaissance drone through repeated aerial ramming.
On 31 July 2024, a Russian Mi-8 helicopter was shot down by over occupied Donetsk, by a Ukrainian FPV drones. The first time a helicopter in combat was destroyed by a drone. The Mi-8 was believed to have been attacked on the ground either during landing or take off.

2023 Gaza War: On October 7, 2023, Hamas launched an invasion of southern Israel, using commercial drones to bomb Israeli guard towers before breaching the border wall. Videos of Israeli troops and a Merkava IV tank being taken out by drones surfaced on the internet.

The largest drone attack in history: As of April 14, 2024, the world's largest drone attack in history took place in the middle of the conflict caused by the developments of the Israeli war on Gaza, with a mass and simultaneous attack of more than 185 Iranian drones in less than a few hours against targets across Israel. This Iranian attack on Israel was carried out in response to the bombing of the Iranian consular building in Damascus (which happened a few days before by the Israeli side).

See also: Anti-drone systems using: electronic jamming and hi-jacking systems, directed-energy weapons (mainly laser), kinetic projectiles, netting, trained eagles etc.
Counter unmanned air system (C-UAS)
Anti-aircraft warfare § AUDS
Electronic beam
Directed-energy weapon, planned to also be used against drones
Laser weapon: Anti-drone systems
Silent Hunter (laser weapon), Chinese anti-drone laser weapon
Electronic warfare (EW) - jamming & hi-jacking
Bukovel (counter unmanned aircraft system), Ukrainian anti-drone electronic warfare system
EDM4S (Electronic Drone Mitigation 4 - System), Lithuanian portable EW anti-drone device
Malyuk assault rifle, Riff model: Ukrainian man-portable battery-powered anti-drone weapon
R-330Zh Zhitel, Russian truck-mounted EW jamming communication station
Kinetic systems
Slinger (weapon system), Australian anti-drone system using an auto-cannon
Large systems & manufacturers
Drone Dome, Israeli anti-aircraft including anti-drone system developed by  Rafael ADS
DronesVision, Taiwanese arms manufacturer, specialising in UAV and anti-UAV technologies
Indrajaal Autonomous Drone Defence Dome, Indian AI anti-drone system
ZALA Aero Group, Russian arms manufacturer, specialising in UAV and anti-UAV EW systems
Other related topics
Non-combatant Casualty Value
PlayStation mentality
Public opinion about US drone attacks
Military robot
Unmanned surface vehicle
Zanana
Civilian casualties from U.S. drone strikes

References: 

External links:  Media related to Drone strikes at Wikimedia Commons