The potential long-term effects on global trade dynamics and international relations due to the U.S.'s increased tariffs and trade restrictions on Chinese goods are multifaceted and complex. Here are some possible outcomes:

1. Trade Diversion: As tariffs on Chinese goods increase, it may become more attractive for U.S. importers to source goods from other countries, leading to trade diversion. This could potentially benefit countries like Vietnam, India, and Mexico, which have the potential to replace China as a sourcing destination for certain products.

2. Global Supply Chain Reconfiguration: The ongoing trade tensions between the U.S. and China may lead to a reconfiguration of global supply chains. Companies may choose to relocate their manufacturing bases to avoid the impact of tariffs. This could lead to a shift in global manufacturing hubs and alter the dynamics of international trade.

3. Increased Protectionism: The U.S.'s actions may embolden other countries to adopt protectionist policies, leading to a rise in trade barriers globally. This could potentially result in a slowdown of global trade and a shift towards regional trade agreements.

4. Impact on Global Economic Growth: The trade tensions between the U.S. and China could potentially lead to a slowdown in global economic growth. The increased tariffs could lead to higher prices for consumers and lower profits for companies, which could negatively impact economic growth.

5. Strained U.S.-China Relations: The increased tariffs and trade restrictions could lead to a further deterioration of U.S.-China relations. This could potentially result in increased tensions and a more confrontational relationship, affecting various aspects of bilateral cooperation, including but not limited to trade.

6. Potential for Retaliation: China may choose to retaliate against the U.S.'s actions, potentially leading to a tit-for-tat trade war. This could further escalate tensions and lead to a more unstable global trade environment.

In conclusion, the increased tariffs and trade restrictions on Chinese goods by the U.S. could have far-reaching implications for global trade dynamics and international relations. The actual outcomes will depend on a variety of factors, including the responses of China and other countries, the evolution of global supply chains, and the overall state of the global economy.