As a professional, I can tell you that executive agreements are an important tool in international relations. These agreements are made between the executive branch of the U.S. government and other nations or international organizations.

Executive agreements are used when the president and his administration determine that a treaty is not necessary or feasible. Unlike treaties, executive agreements do not require Senate approval, making them a faster and more flexible way to make agreements with foreign governments.

There are several circumstances in which executive agreements are used. One example is when dealing with minor issues or matters that do not require a binding treaty. For instance, an executive agreement may be used to establish a cultural exchange program or promote scientific collaboration between countries.

Another circumstance is when time is of the essence. The process of making a treaty takes longer since it requires the approval of the Senate. If there is a pressing issue that requires immediate action, an executive agreement can be used to expedite the process.

Additionally, executive agreements are often used in situations where the president has broad foreign policy powers. For example, the president may create an executive agreement to establish rules for the use of military force or to implement economic sanctions.

It`s important to note that executive agreements are not a replacement for treaties. They can only be used in certain circumstances and are subject to the same limitations as any other type of agreement. That being said, they are a useful tool for the executive branch when dealing with foreign governments.

In conclusion, executive agreements are used when the president and his administration determine that a treaty is not necessary or feasible. They are often used for minor issues or matters that do not require a binding treaty, when time is of the essence, or when the president has broad foreign policy powers. These agreements are an important tool in international relations and help the U.S. government establish relationships with other nations or international organizations.