The Gerasimov Doctrine is a way for countries to be prepared for war, without actually going to war. It was invented by General Valery Gerasimov, who was a Russian general. The doctrine works by using law, politics, military forces, and technology, instead of just guns and soldiers, to fight a conflict. This means that countries can use different kinds of pressure to weaken their opponents. For example, they can use fake news and hacking to try and weaken the other country's military or economy. Or they can spread propaganda to try and make the other country's leaders look bad. The goal of the Gerasimov Doctrine is to make a conflict more successful and last longer, without needing to fight on the ground.