The Houthi forces of Yemen have launched a drone attack on oil facilities and the airport in Abu Dhabi, capital of the United Arab Emirates. UN Secretary-General Antonio Guterres condemned the strike, saying:
attacks on civilians and civilian infrastructure are prohibited by international humanitarian law.
This appears to be saying that the attacks were against international law because of the nature of the targets. However, airports are generally the first target of any military operation against a country, and oil facilities have been high on the list of targets in warfare since the internal combustion engine has been a weapon of war. In response the coalition has carried out air raids in the Yemeni capital Sanaa, killing more than 12 people and pictures apparently showing damaged residential buildings. This has elicited no such claims of breach of international humanitarian law.
How is "civilian infrastructure" defined in international humanitarian law? Is it a reasonable interpretation that this would include oil production facilities and an airport but not residential buildings?