Chinese President Xi Jinping oversaw the largest naval parade in his country’s history Thursday, as China concluded two days of military drills in the hotly contested South China Sea, a massive show of strength amid growing tensions with the United States. At least 10,000 personnel took part in drills, which involved 48 naval vessels and 76 fighter jets, said the country’s Defense Ministry. Xi, dressed in camouflage military fatigues and speaking aboard the Chinese destroyer Changsha, called for further modernization efforts, and underlined his goal of transforming the country’s navy into a “world-class force” under the leadership of the Chinese Communist Party. China’s only aircraft carrier, the Liaoning, took part in the parade with a display of J-15 fighter jets under Xi’s observation. Since coming to power in 2012, Xi has overseen considerable growth in Chinese naval power. Whereas previously the country’s navy was largely defensive and confined to its immediate coastal waters, today it boasts significant “blue-water” capabilities, meaning it can project force into areas such as the Indian and Pacific oceans. But it’s the South China Sea that represents the biggest potential challenge. The Chinese government claims a huge swath of territory across the sea, overlapping with claims of the Philippines and Vietnam, among others. The massive PLA navy drills in the South China Sea sent a clear signal to the other claimants in the region, as well as the US, Collin Koh, research fellow at the S. Rajaratnam School of International Studies’ Maritime Security Program, told CNN. “The PLA Navy is there and they’re there to stay,” he said. Taiwan drills announced In a foreshadowing of future drills, the Fujian provincial maritime authority on Thursday announced live-fire naval exercises for April 18 in the Taiwan Strait, the first Chinese naval exercise in waters off the self governing island since September 2015. The announcement of drills in the Taiwan Strait comes after a month of growing tensions between China, Taiwan and the United States. Taiwan has been self-governed since a bloody civil war ended in 1949. Though both Taipei and Beijing view the island as part of China, neither government recognizes the legitimacy of the opposing side, with Beijing warning that it could retake the island by force if necessary. The US, which provides arms to the island, announced in the past week it would allow American manufacturers to market submarine technology to Taiwan. In March, US President Donald Trump signed the Taiwan travel act to encourage visits by officials in both Washington and Taipei, triggering a stream a thanks from the Taiwanese government and recriminations from Beijing. Xi had a blunt message for Taiwan during a nationalistic speech at the conclusion of the China’s National People’s Congress in March, where he warned against any attempts to “split the motherland.” “Every inch of our great motherland’s territory cannot be separated from China,” he said, drawing loud applause from his audience inside the Great Hall of the People. US tensions over trade The Chinese exercises are taking place amid rising tensions between Beijing and Washington over trade, but analysts have also expected the Trump administration to harden its policy on the South China Sea. A US aircraft carrier, the USS Theodore Roosevelt, arrived Wednesday in Manila, Philippines, for what was described as a “scheduled port visit.” The US Navy recently conducted several “freedom of navigation” operations with warships sailing near increasingly militarized man-made Chinese islands in the South China Sea, triggering strong protests from Beijing. Earlier in the week, Xi gave a much anticipated speech at the annual Boao Forum for Asia in Hainan province on the northern edge of the South China Sea. The forum is the Chinese equivalent of the World Economic Forum held in Davos, Switzerland, involving high-level talks among economic leaders. Speaking Tuesday, Xi promised a new phase of economic “opening up” from China amid threats of a possible trade war with the United States. He also said China would stick to “the path of peaceful development” going forward. Holding such large drills directly on the back of their economic forum sent a clear message to the world, Koh said. “This is to highlight China is not just an economic power, but also a military and maritime power,” he said.