The United States is the most important leader within NATO. NATO develops a new strategy every 10 years. The United States' strategy focuses on two main things: Russia and China. It regards Russia as the direct and most obvious threat, while China is classified as a challenge to the system. The United States' strategy is based on the principle of offensive realism and offshore balancing, using NATO as a proxy to take military measures to sanction Russia in response to the threat it poses to the European continent. In response to China's global challenges, the United States intends to build a global preventive system to contain its rise. However, the United States' national strength is ostensibly declining, and the use of offshore balancing strategies cannot only consider the effectiveness of proxies from the military level, but should also consider geopolitics and the intentions of proxies.