Overview of International Hypersonic Weapons Programmes and Potential Ways to Exploit Physical Phenomena Around Hypersonic Weapons to Improve Surveillance Capabilities (Detection and Tracking) The Evolving UAS Threat- Lessons from the Russian-Ukrainian War Since 2022 on Future Air Defence Challenges and Requirements Analysis of the Related Physical Phenomena and Aerodynamic Performance of Hypersonic Vehicle(s) and Possible Ways of Exploiting Those Data in Order to Improve Surveillance Capabilities. “The Evolving Asymmetric Threat of Unmanned Aircraft Systems: A Weapon of Choice for Non- State Actors, How Alliance Could Diminish Such Threat”