What During a war which type of trade barrier is often used the most between the warring countries?

During a war, the most commonly used trade barrier between warring countries is an embargo. An embargo involves the prohibition of trade, effectively cutting off economic exchanges and restricting the flow of goods, services, and resources. This measure aims to weaken the enemy's economy and limit their access to essential supplies, thereby exerting pressure on their war efforts. Additionally, tariffs and quotas may also be employed, but embargoes are more definitive in severing trade relations.