USS Lassen ( Image credits- Wikimedia Commons/ United States Navy) Source- Want China Times President Xi Jinping of China is faced with a dilemma on how to respond to a US Navy vessel's patrol close to two reefs controlled by China in the disputed South China Sea, Ding Shuh-fan, director of the Institute of International Relations of National Chengchi University in Taipei said Tuesday. The USS Lassen sailed to waters within the 12 nautical mile territorial limit claimed by China around the artificial islands China has built on Subi and Mischief reefs earlier in the day in a challenge to China's territorial claims to uphold freedom of navigation. Ding said both China and the US will maintain their "fight without breaking" strategy, meaning exercising self-constraint to avoid further escalation of tensions while continuing to compete with each other. Ding said the US is fully justified in its action based on legal principles as the United Nations C