So, it looks like we now have Leclerc tanks and Leclerc-based AFV's fighting in Yemen.
The Saudis is supporting the Shiite movement Ansar Allah by their modern armor - the Leclerc tanks. Previously unseen armor arrived to the Aden region - these are presumably the UAE Leclerc tanks, previously exported to this country. Modern BMP-3's appeared there as well (same source) and it's possible that these vehicles do come with UAE crews, they aren't just leased vehicles. The Emirates do not deny their involvement, at least two deaths of UAE soldiers were officially reported recently.
Video (from 2:04)
Leclerc-based ARV (DCL) was also spotted in the streets of Aden