The Rise of Drone Warfare
Drone warfare transformed armed conflict in the twenty-first century by removing pilots from the cockpit and making persistent, long-range, armed surveillance a normal instrument of both counterterrorism and conventional war. The US armed the Predator in 2001 and used it to conduct targeted killings across Pakistan, Yemen, and beyond, prompting legal and ethical disputes over sovereignty, civilian casualties, and executive power that have never been resolved. Meanwhile the technology diffused: Turkish Bayraktar TB2s reshaped warfare in Libya, Nagorno-Karabakh, and Ukraine, and cheap commercial quadcopters and naval drones became mass weapons in Ukraine's defense against Russia. By the 2020s no major military planned for the future without them, and the question of who may be killed, by whom, and on what authority had become a global one rather than an American one.
Events
First Armed Predator Flights
After years of unarmed reconnaissance over Bosnia, Iraq, and Afghanistan, the United States armed the RQ-1 Predator with AGM-114 Hellfire missiles in the autumn of 2001, creating the first purpose-built armed surveillance drone. The program, directed jointly by the CIA and the Defense Department after the September 11 attacks, saw its first combat shots in Afghanistan in October and November 2001, including the famous footage of a Hellfire strike against a vehicle believed to carry Taliban leader Mullah Omar. Armed Predators solved a problem that had frustrated the CIA since the late 1990s, when unarmed Predators tracked Osama bin Laden but could not attack, a limitation exposed in the 9/11 Commission Report. The change turned the drone from a sensor into a weapon and created a new category of warfare, the remotely piloted targeted killing, which would dominate the following decade.
Location: Afghanistan
First CIA Drone Strike in Yemen Kills a High-Value Target
On November 3, 2002, a CIA-operated Predator fired a Hellfire missile at a car in Yemen's Marib province, killing Qaed Salim Sinan al-Harethi, a suspected al-Qaeda figure linked to the USS Cole bombing, along with five other men including a US citizen, Kamal Derwish. The strike, carried out under the Bush administration, was the first known targeted killing by drone outside a recognized battlefield and set a precedent for the extraterritorial program that followed. Lawyers in the administration debated its legality, and critics questioned whether the killing of an American citizen abroad without due process was lawful, an argument that would return in force nine years later. Human rights organizations and the UN special rapporteur on extrajudicial executions raised concerns that the precedent blurred the line between war and law enforcement. The Yemen strike is widely regarded as the opening of the drone campaign as a standing global program.
Location: Marib, Yemen
The Pakistan Drone Campaign Begins
In June 2004 a CIA Predator strike killed Nek Mohammed Wazir, a Pakistani Taliban commander, in South Waziristan, opening the covert drone campaign in Pakistan that would run for over a decade. The strikes, carried out under secret agreements with Pakistan's military and intelligence services that Islamabad publicly denied while privately permitting, expanded from a handful of attacks to a peak of well over 100 per year during 2009-2010. The Bureau of Investigative Journalism and other monitors estimated cumulative deaths in the thousands, with a contested minority being civilians, and the strikes became a defining grievance in Pakistani politics and a recruiting argument for militant groups. The program's covert character meant that the US government did not publicly acknowledge most strikes, a secrecy that drew sustained criticism from legal scholars, journalists, and, in 2013, a UN special rapporteur's report calling for transparency. The Pakistan campaign normalized drone strikes as a standing tool rather than an emergency measure.
Location: Waziristan, Pakistan
Obama's Expansion and the Kill-List Framework
The Obama administration institutionalized drone targeting through a formal interagency process producing lists of approved targets, and by 2016 estimates the total number of US drone and air strikes across Pakistan, Yemen, Somalia, and Libya was several times the number under his predecessor. On September 30, 2011, a joint CIA-JSOC strike in Yemen killed Anwar al-Awlaki, a US citizen and al-Qaeda propagandist, along with Samir Khan, and two weeks later a separate strike killed al-Awlaki's sixteen-year-old son, Abdulrahman, killings that triggered sustained legal controversy over citizenship and due process. In 2013 President Obama announced policy guidelines restricting strikes to targets who posed a continuing and imminent threat, with near-certainty of no civilian casualties, a framework criticized as too vague to constrain. The administration also began to acknowledge the program publicly for the first time, in speeches and in a 2013 Department of Justice white paper. The drone campaign had become a permanent feature of US national security policy, operated under claimed legal authority from the 2001 AUMF.
Location: Awlaki strike, Yemen / Washington, DC, United States
The Killing of Qasem Soleimani
On January 3, 2020, a US MQ-9 Reaper drone fired missiles at a convoy on the Baghdad airport road, killing Qasem Soleimani, commander of Iran's Quds Force, along with Iraqi militia leader Abu Mahdi al-Muhandis and others. The strike, ordered by President Trump, killed the most senior Iranian military commander in a decade and was justified by the administration as a defensive strike against an imminent threat, a claim contested by legal scholars and by the leaked details of a Pentagon notification to Congress. Iran responded with ballistic missile attacks on US bases in Iraq, and Iraq's parliament demanded the withdrawal of US forces, showing how a single drone strike could push a region toward open war. The UN special rapporteur on extrajudicial executions issued an opinion that the killing was unlawful. The Soleimani strike marked the arrival of drone killing as a state instrument used against senior officials of a foreign government, not only against militant networks.
Location: Baghdad, Iraq
Bayraktar TB2s in Nagorno-Karabakh and Libya
The 2020 Nagorno-Karabakh war between Azerbaijan and Armenia demonstrated, for the first time in a conventional conflict between states, how massed medium-altitude armed drones could destroy tanks, artillery, and air defenses. Turkish-made Bayraktar TB2 drones, combined with Israeli loitering munitions, gave Azerbaijan a decisive edge, destroying hundreds of Armenian vehicles in widely circulated gun-camera footage that changed public expectations of modern war. The same platforms had already influenced Libya's civil war, where TB2s flown by the Government of National Accountability's forces struck General Khalifa Haftar's Russian-supplied defenses, and would soon see combat in Ukraine, Ethiopia, and elsewhere. The Karabakh war is generally credited as the moment when cheap, exportable armed drones moved from counterterrorism to conventional battlefield dominance, prompting militaries worldwide to accelerate procurement and counter-drone programs. Arms exports, not just domestic programs, now drove proliferation.
Location: Nagorno-Karabakh
Drones at Scale in the Ukraine War
Russia's full-scale invasion of Ukraine on February 24, 2022 turned the drone into the conflict's defining weapon on both sides. Turkish TB2s attacked Russian columns in the war's opening days, Ukraine's volunteer technicians and the Ministry of Digital Transformation organized thousands of commercial quadcopters for artillery spotting and grenade dropping, and Ukraine fielded naval drones that damaged or destroyed Russian ships in the Black Sea, including the strikes on the Sevastopol naval base in 2023. Russia responded with Iranian-designed Shahed loitering munitions used in massed strikes on Ukrainian cities and with its own FPV and Lancet drones, and the two armies raced to jam, spoof, and hunt each other's drones with electronic warfare. First-person-view drones carrying small explosive charges became a leading cause of vehicle and personnel losses, and their low cost, a few hundred dollars against tanks worth millions, changed force economics. The war is widely treated by militaries worldwide as the definitive demonstration that cheap massed drones are a central, not peripheral, element of combat.
Location: Ukraine
Global Diffusion and the Legal Debate
By the mid-2020s armed and surveillance drones had been procured or fielded by well over a hundred states, with major exporters including the United States, China, Turkey, Israel, and Iran, and non-state actors from Yemen to Myanmar flying modified commercial systems. The legal controversy that began with Yemen in 2002 remained unresolved: whether targeted killing outside recognized battlefields violated sovereignty and international human rights law, what standard of imminence applied, and who was accountable for civilian casualties. The UN Security Council and General Assembly received repeated reports on drone casualties, and in 2023-2024 the use of cheap drones by cartels, militias, and criminal organizations expanded the issue from warfare to domestic policing. Civilian casualty accountability, transparency of strike programs, and the absence of binding international rules remained the subject of diplomatic initiatives, including efforts to regulate lethal autonomous weapons. Drone warfare's central paradox was now permanent: a technology that reduced risk to the attacking force while raising unresolved questions about the legal and moral limits of remote killing.