Hu Jintao served as the President of the People's Republic of China from 2003 to 2013. During his tenure, he also held the positions of General Secretary of the Communist Party of China and Chairman of the Central Military Commission. His leadership was characterized by a focus on scientific development and the promotion of a 'harmonious society,' marking a significant period of economic growth and global integration for China.

Boris Yeltsin became the first President of the Russian Federation in 1991. His presidency followed the dissolution of the Soviet Union, marking a significant transition in Russian history from a communist state to a federal republic. He played a pivotal role in the political and economic reforms that defined the post-Soviet era in Russia during the 1990s.

Mustafa Kemal Atatürk is the founding father of the Republic of Turkey. Following the collapse of the Ottoman Empire after World War I, he led the Turkish War of Independence and subsequently implemented a series of sweeping political, legal, and cultural reforms that transformed the nation into a modern, secular, and democratic state.

Ronald Reagan, the 40th President of the United States, was a prominent Hollywood actor before entering politics. He appeared in numerous films during the 1930s, 1940s, and 1950s. His transition from the entertainment industry to public service, including his tenure as the Governor of California, eventually led him to the presidency in 1981.

Mahmoud Abbas has served as the President of the Palestinian National Authority since 2005. He is a prominent political figure and the chairman of the Palestine Liberation Organization (PLO), representing the Palestinian people in international diplomatic efforts and governance.

Mahmud Abbas, the President of the Palestinian National Authority, is widely referred to by his kunya, 'Abu Mazen'. This name is used frequently in both local and international media to identify him. The use of such honorifics is a common cultural practice in the Arab world, and 'Abu Mazen' has become his primary public identifier throughout his political career.

Prague, the capital of the Czech Republic, is famously known as the 'Golden City' or 'City of a Hundred Spires'. This nickname dates back to the 19th century, reflecting the city's rich architectural heritage, particularly the golden-hued spires of its historic churches and buildings that glow under the sunlight.

Kiev, the capital of Ukraine, is historically and culturally referred to as the 'City of Parks' due to its extensive green spaces, numerous botanical gardens, and large public parks integrated into the urban landscape. These green areas provide significant environmental benefits and recreational spaces for the city's residents, contributing to its unique urban identity.

Venice is historically and poetically referred to as the 'Queen of the Adriatic.' This title reflects its past status as a powerful maritime republic that dominated trade and naval power in the Adriatic Sea during the Middle Ages and the Renaissance. The city's unique architecture, built on a lagoon, further cements its reputation as a jewel of the Adriatic region.

The Maastricht Treaty, which created the European Union in 1993, established a three-pillar structure. The first pillar was the European Community (EC), which replaced the European Economic Community (EEC). This pillar handled economic, social, and environmental policies, while the other two pillars focused on Common Foreign and Security Policy (CFSP) and Justice and Home Affairs (JHA).