China"s President Xi Jinping marked the country"s 50 years of membership in the UN with a speech calling for greater global cooperation, BBC reported. China was a founding member of the UN but was blocked by the US from taking up its seat until 1971. Xi repeated calls for global cooperation at the UN, adding that issues like terrorism, climate change and cyber security required multilateral solutions. Taiwan lost its seat at the UN after China — a permanent member of the UN security council — joined the organisation in 1971. China sees Taiwan as a breakaway province, while Taiwan claims to be a free and independent country. However, China"s One China policy asserts that there is only one sovereign Chinese government, and that Taiwan is an inseparable part of the country that is to be reunified one day with the mainland. Xi said that the decision to "recognise the representatives of the government of the People"s Republic of China as the only legitimate representatives of China to the United Nations ... was a victory for the Chinese people and a victory for people of the world". There have been rising tensions between China and Taiwan in recent months. China has flown military planes and fighter jets into Taiwan"s air defence zone, prompting the island"s defence minister to say tensions between the two countries were at their worst in 40 years. Taiwan also accuses China of using its role within the UN to prevent Taiwanese delegates from attending conferences by specialised UN agencies, therefore denying them access to international cooperation in fields like medical sciences and aviation. China"s influence in the UN has continued to grow since it joined the organization in 1971. In 2018, China became one of the largest financial contributors to the UN. Its contribution rose to 12% of its GDP in 2019 from 7.9% in 2018, making it second only to the US at 22% and surpassing Japan at 9.7%. In recent years, a growing number of key roles in the organization, like the Head of the Food and Agriculture Organisation (FAO), have been staffed by Chinese nationals. China has also been accused by critics of using its clout within the organisation to rally support for its treatment of Uyghurs in Xinjiang province.