The Syrian military found proof (cigarettes, flag and crossword) of Ukrainian nationals fighting for ISIS in Syria when storming a camp belonging to ISIS.
Recurring pro-Kremlin disinformation that Ukraine is somehow involved with or training ISIS fighters. As "proof" this time, Russian Ministry of Defence TV (recurring disinformation outlet https://euvsdisinfo.eu/dependent-media-russias-military-tv-zvezda/) is using a video which appears to be staged, where men dressed as soldiers speaking with a Syrian accent find Ukrainian cigarettes and a Ukrainian flag in what seems to be a rather luxurious building. At the end of the video the men randomly shoot out through the windows, without being shot at back. Further debunking at Stopfake.org https://www.stopfake.org/fejk-sirijskie-voennye-vzyali-shturmom-lager-ukrainskih-boevikov-ig/.