Do all Muslims have to pray salat-ul janaza when Mujahideen die? - Q&A - Sh. Shady Alsuleiman

Some Muslim youth believes that all Muslims in the world have to pray salat-ul janaza when Mujahideen die somewhere in the world. These individuals many times criticize Muslims for not praying salat-ul janaza when Mujahideen die some place in another country. What does Islam say about this?