There are many factors that affect a country's policy changes in international affairs, including: 1. **Changes in the international situation**: Adjustments in the international political landscape, the outbreak and resolution of regional conflicts, and fluctuations in the international economic situation will prompt a country to reassess its own interests and adjust its foreign policy. For example, after the end of the Cold War, many countries have made major adjustments to their foreign policies. 2. **National interest demands**: A country's core interests, such as sovereignty, territorial integrity, and economic development, have always been the fundamental starting point for policy making. When these interests are challenged or new opportunities arise, policies will change accordingly. For example, as energy demand grows, a country's foreign policy in the energy field may become more proactive. 3. **Domestic political landscape**: Domestic political factors such as regime change, political factional struggles, and public opinion will affect government decision-making. A new government may implement a different foreign policy from its predecessor; the public's strong concern about a certain international issue may also prompt the government to adjust relevant policies. 4. **Geopolitical factors**: Geopolitical factors such as geographical location and relations with neighboring countries will affect a country's security considerations and foreign strategy. For example, political turmoil or military expansion in a neighboring country may lead the country to strengthen border security measures and adjust its diplomatic strategy. 5. **International organizations and alliance relations**: Changes in roles in international organizations and adjustments in relations with allies will drive changes in national policies. For example, a change in a country's status in the UN Security Council may lead it to pay more attention to multilateral foreign policy. 6. **Leaders' diplomatic philosophy**: The leader's personal political beliefs, international relations philosophy and leadership style have a direct impact on the country's foreign policy. Hard-line leaders may adopt a more confrontational foreign policy, while moderate leaders tend to seek cooperation.