International law interacts with domestic political systems by establishing frameworks that govern relations between states while influencing national policies and practices. Treaties, customary law, and international agreements compel nations to adhere to specific standards in areas like human rights, environmental protection, and trade. Domestically, governments must align their laws with international obligations, sometimes leading to adjustments in policy. Additionally, international law affects diplomatic relations and can provide mechanisms for resolving disputes. However, the implementation of international law can be complex, often depending on national willingness and legal frameworks to comply effectively.