Explanation:

- Option 1: Russia-Ukraine war

- This option is about geopolitical conflicts. The COP-27 Summit doesn’t specifically address geopolitical issues like the Russia-Ukraine war.

- Option 2: Terrorism and counter-terrorism

- This topic relates to global security concerns. Terrorism isn't the focus of COP-27.

- Option 3: Climate change

- COP-27 stands for the 27th Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC). It focuses on climate-related strategies, international agreements, and global sustainable practices.

- Option 4: Interpol

- This involves international police cooperation. It is unrelated to climate summits.