City-to-city cooperation
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Memorandum of Understanding (MOU) / Letter of Intent (LOI)
30 June 2003 – Daejeon (South Korea) – MOU
12 September 2006 – Shenzhen, Guangdong Provinz (China) – MOU
16 November 2006 – Moskau (Russia) – MOU
19 September 2012 – Istanbul (Turkey) – MOU
5 June 2013 – Incheon (South Korea) – LOI
1 June 2015 – Shanghai (China) – MOU
24 May 2019 – Ho Chi Minh Stadt (Vietnam) – MOU
8 March 2023 – Izmir (Turkey) - MOU