Kyiv is the capital and largest city of Ukraine located on the Dnieper River. It has a population of over 3 million people and is a major political, economic, and cultural center of Ukraine. Some of Kyiv's major challenges include improving its aging transport and engineering infrastructure, developing its tourism industry, and addressing environmental issues like air pollution. The city also needs to focus on increasing access to affordable healthcare and improving economic development and private investment to support its knowledge-based economy.