Source:
https://scmp.com/article/682741/chinese-probe-accompany-russian-rocket-mars-mission

Chinese probe to accompany Russian rocket on Mars mission

A Chinese probe will ride a Russian rocket to Mars next year, fulfilling some scientific goals and satisfying the two countries' desire to work more closely on space exploration.

The probe, the Yinhuo-1 (or firefly), will carry several cameras, a magnetic field sensor and an ion detector, making it much lighter than its co-passenger, the Phobos-Grunt, a Russian landing craft that weighs more than 2 tonnes.