There is no simple answer to this question, but it involves multiple complex factors such as intelligence activities, national interests and international relations. Here are some angles to consider: 1. Intelligence and crisis prevention: Some countries believe that understanding the movements and decision-making tendencies of other countries' leaders can help discover potential risks, so as to take timely measures to prevent conflicts or misjudgments. In theory, this may play a certain positive role in global stability. 2. Violation of international norms and crisis of trust: Secret surveillance activities usually violate international law or international practice and easily undermine trust between countries. Once intelligence activities are exposed, they may lead to diplomatic disputes, even retaliation and regional tensions, and aggravate international instability. 3. Moral and ethical considerations: There are also ethical issues behind this behavior. Secret surveillance itself is considered to be an act of opacity and disrespect for the sovereignty of other countries. It may set a bad example for the international community and induce more similar confrontational behaviors. 4. Strategic balance and intelligence competition: In intelligence wars, countries often monitor each other, which to a certain extent forms a "strategic balance". Some people believe that checks and balances can prevent the expansion of unilateral actions, but they may also trigger escalating confrontations and make the global situation more tense. In general, secretly monitoring the behavior of other countries' leaders may help some countries to obtain more information in the short term, thereby protecting their own security. However, in the long run and at a macro level, this practice is likely to cause a crisis of trust, diplomatic conflicts and moral disputes, and is not conducive to building an open, transparent and stable international order. Global stability requires a system based on rules, dialogue and cooperation, rather than relying on secretive and opaque means.