There are several major threats to international security in the present world scenario that countries face today. Here are the main concerns:

• 1. Terrorism: Terrorism is one of the biggest concerns for countries worldwide. The rise of extremist groups like ISIS and Al-Qaeda has created a global security threat that requires constant monitoring and action.
• 2. Cybersecurity: In today's digital world, cybersecurity is a significant concern. A cyber-attack could cripple the infrastructure of a country and cause extensive damage.
• 3. Nuclear disarmament: The issue of nuclear disarmament remains a significant concern as countries continue to invest in weapons of mass destruction. This situation raises the risk of nuclear war and the potential destruction of entire regions.
• 4. Climate change: Climate change is a global concern that poses a significant threat to international security. The increasing frequency of natural disasters, food and water scarcity, and mass migration are some of the adverse effects.
• 5. Regional Conflicts: Regional conflicts can destabilize entire regions, creating mass migration, and cause severe economic damage. Countries continue to engage in disputes over borders, resources, and political influence.

These are some of the major issues that nations face regarding international security. It highlights the need for collaboration and measures to address these concerns.