Some of China’s most cutting-edge weaponry will roll through the heart of Beijing in amassive military parade.

The spectacle will mark 80 years since the victory over Japan in World War II. It will also show just how far thePeople’s Liberation Army has come in an ambitious and fast-paced modernisation drive.

But not everything will be on display on Wednesday. Some of the most potent andadvanced weapon systems will remain hidden from public view – either because they are still under development, too sensitive to be revealed, or because it is not possible to include them in the parade.

These are some of the most important assets in Chinese military technology that you won’t see in Tiananmen Square.

Under development

Most prominent are twosixth-generation stealth fighter jets – unofficially dubbed the J-36 and J-50 – that drew global attention when they made maiden flights at the end of last year. They have since been spotted in more test flights.