They can range in size from a hand's breadth to the 13.5 meters of the American Global Hawk (with a wingspan of 35 meters). They can weigh less than a kilogram or hundreds of tons. Some are suicide drones launched like kamikazes, others lurk in the sky to gather enemy intelligence. But they all share one characteristic: they are pilotless and remotely controlled. Almost every army has them, but the United States, Ukraine, Iran, Russia, Turkey, and China have developed some of the most widely used models. Here's a compilation of the main aerial drones that have changed the rules of warfare.

Wars continue to cause destruction and death, but battlefield strategy must change because new elements are completely transforming how we attack and defend. The clearest example is drones, which have revolutionized warfare in Ukraine and other conflicts. Therefore, this weekend we're focusing on drones in the military and defense sectors, explaining what they are, how they work, and how they have changed warfare.

Until now, the Norwegian government's global pension fund, which is financed by revenue from oil and gas production, had excluded some of the largest weapons manufacturers from its investments. Following the fund's ethical criteria, set by the Nordic country's Parliament, companies such as Airbus and Boeing, as well as BAE Systems (the world's second-largest military contractor), were not part of its investment portfolio due to their contribution to the manufacture of nuclear weapons components.