Expert speak: Downing of US drone in Russian jet encounter prompts counter claims of violations in the sky

By Ashley S. Deeks, Professor of Scholarly Research in Law, University of Virginia

The details are disputed, but either way the result was the same: On March 14, 2023, a US drone crashed into the Black Sea after an encounter with Russian aircraft. 

According to the US version of events, the unarmed MQ-9 surveillance drone was flying in international airspace when two Russian fighter jets dumped fuel on the drone before colliding with it, violating international law. 

The Russian Defence Ministry denied that its aircraft contacted the US drone. Instead, Russia asserted that the drone was flying toward Russia's borders with its transponder off, suggesting that Russia found the flight suspicious. 

In addition, Russia said, the US drone violated the 'temporary boundaries' that Russia had established for its operations against Ukraine and crashed on its own. 

US military has released footage of mid-air encounter between Russian Su-27 fighter jet and a US drone that was forced down over the Black Sea:

In light of Russia's past misrepresentations about its military activities during its invasion of Ukraine, I view Russia's assertions with scepticism. Moreover, as someone who studies international law and formerly served in the US State Department as a lawyer advising on issues related to armed conflict, I see this episode as highlighting the right of countries to operate aircraft and drones in international airspace, even for the purposes of spying on another state. 

Showing 'due regard' If the US characterisation of the facts is correct, then Russia did indeed violate international law by interfering with the US drone. 

Under Article 87 of the UN Convention on the Law of the Seas, the high seas, basically waters that are not any country's territorial sea or exclusive economic zone, are open to all states. And the right of a country to operate on the high seas includes the freedom of overflight. 

The convention also states that the freedoms shall be exercised by all states with due regard for the interests of other states in their exercise of the freedom of the high seas. 

The United States is not a party to the convention, which was signed in 1982 and currently has 168 parties, including Russia. Nevertheless, the US recognises many of its provisions as customary law; indeed, a key US naval handbook recognises that the aircraft of all states are free to operate in international airspace without interference by other states.

As such, Russia violated international law when it failed to act with due regard for the US right to engage in freedom of overflight. 

In fact, based on the US account, Russia directly interfered with that right. And it is presumably on this basis that the State Department spokesman called the drone's downing a brazen violation of international law.

Any Russian concerns that the US drone may have been spying on its military operations would not alter this conclusion. Freedom of overflight in international airspace includes the act of monitoring activities inside another state's territory, as long as the monitoring occurs from within international airspace. 

So it would not matter from the perspective of international law whether the United States was using the MQ-9 to spy on military activities inside Russia or Russian-controlled Crimea. Aircraft in conflict zones Russia appears to be taking the position that it was entitled to set up boundaries for its 'special military operation' in Ukraine and that the United States disregarded those boundaries. 

Russia may be referring here to a 'maritime exclusion zone' that Russia set up in February 2022 to prohibit navigation in the northwest portion of the Black Sea. 

In general, the United States considers such zones to be lawful if their purpose is to direct neutral ships and aircraft away from conflict areas; they can play an important role in reducing the risk that such vessels are mistakenly attacked. 

The United States itself established a 'maritime safety zone' in the Mediterranean Sea in 2003 in connection with its invasion of Iraq. However, neutral ships and aircraft do not become lawful targets merely because they enter such zones. 

Russia would only have had a reasonable claim to use force against, or interfere with, the US drone if it posed an imminent threat of an armed attack or was otherwise a legitimate military target during an armed conflict. 

For this to be the case, the US drone would have had to be taking direct part in hostilities, and it is known that the MQ-9 was unarmed. On solid ground in the skies. 

Assuming the US account is correct, it would not be the first time that a country has interfered with a US surveillance aircraft in an unsafe manner and effectively downed it. 

In 2001, a Chinese fighter jet bumped into a US signals intelligence aircraft that was operating 70 miles from China's Hainan Island. The US aircraft was damaged in a way that forced it to make an emergency landing on Hainan, while the Chinese fighter jet itself crashed. 

At the time, the United States asserted that international law, including the due regard principle, permitted the United States to conduct surveillance flights in China's exclusive economic zone, which the US considered to be international airspace. 

China didn't and detained the 24 US crew members, demanding an apology from Washington. Since then, China has intercepted Australian and Canadian aircraft that were engaged in routine surveillance in international airspace, prompting complaints similar to those the United States is making now. 

In both the China case and the recent Black Sea incident, the United States has taken a consistent, widely shared position on the use of international airspace. As such, I believe it is on solid ground in objecting to Russia's actions as unlawful.

(With inputs from PTI)