Which aircraft did the German navy purchase to upgrade NATO's air defense?

The Tornado aircraft is the correct choice for its role in upgrading NATO's air defense. This multi-role combat aircraft was developed by a consortium of nations, including Germany, and is specifically designed for both air-to-ground and air-to-air operations. The Tornado provides enhanced capabilities in terms of electronic warfare, reconnaissance, and precision strike, which are crucial for modern air defense frameworks within NATO. Its integration with NATO systems allows for improved interoperability among member nations, facilitating unified air operations and strengthening collective defense initiatives.

The other aircraft listed do not have the same direct relationship with NATO's air defense modernization efforts as the Tornado.