The S-400 Air Defence Missile System was developed by Russia.

The S-400 Air Defence Missile System is a highly advanced surface-to-air missile system developed by Russia. It is designed to provide air defense against a wide range of threats, including aircraft, cruise missiles, and ballistic missiles. The system is known for its long-range capabilities and high effectiveness, making it one of the most sought-after air defense systems in the world.

Key Features of the S-400 Air Defence Missile System:

1. Long-Range Capability: The S-400 system has a maximum engagement range of up to 400 kilometers, which allows it to effectively engage targets at long distances. This enables it to provide air defense coverage over large areas, making it ideal for protecting strategic locations and military installations.

2. Multifunction Radar: The system is equipped with a multifunction radar that can track and engage multiple targets simultaneously. This allows it to effectively engage multiple threats at the same time, enhancing its overall effectiveness.

3. Various Missile Types: The S-400 system is capable of launching different types of missiles, including long-range surface-to-air missiles and medium-range missiles. This flexibility allows it to adapt to different threat scenarios and engage a wide range of targets with varying capabilities.

4. High Mobility: The S-400 system is highly mobile and can be rapidly deployed to different locations. It can be transported by various means, including trucks, trains, and ships, making it versatile and easily deployable in different environments.

5. Advanced Electronic Countermeasures: The system is equipped with advanced electronic countermeasures, including jamming systems and decoys, which can help to disrupt and confuse enemy aircraft and missiles. This adds an additional layer of protection and enhances the system's overall effectiveness.

Global Significance and Controversies:

The S-400 Air Defence Missile System has gained significant attention and interest from various countries around the world. It has been exported to several countries, including China, India, and Turkey. However, its export has also raised concerns and controversies due to its potential impact on regional security, particularly in areas of geopolitical tension.

For example, the purchase of the S-400 system by Turkey has strained its relations with the United States and other NATO allies. The United States has expressed concerns over the system's compatibility with NATO's defense systems and its potential to compromise the security of advanced Western military technology.

In conclusion, the S-400 Air Defence Missile System was developed by Russia. It is a highly advanced and capable air defense system that has gained global significance and raised controversies due to its export and potential impact on regional security.