Three of the six PLAAF 🇨🇳 Y-20As that flew to 🇷🇸 Serbia at Nikola Tesla Airport, Belgrade.

44.8238°, 20.2884° https://t.co/PJw63VmPIx>— Evergreen Intel (@vcdgf555) April 9, 2022

There is very little information coming out to explain what 6 large transport planes are doing in Serbia. In previous years China has sent troops to Serbia for joint exercises.
Serbia is very anti-Nato, and have a close working relationship with the Chinese. The question remains, is China staging military troops to join the Russians in the war in Ukraine? Or are these planes bringing in weapons that could be used in that war?

In addition to that, there is a rumor that a large train load of tanks are being sent from China to Russia. Hal turner released this information along with maps showing the route of the train across Siberia. So far no photos of the train has been seen.
from Turner:
"Intel just received saying trains along the Trans-Siberian Railroad are loaded with "hundreds of Chinese Main Battle Tanks and other vehicles" headed northwest toward Russia/Europe Borders. Trains are said to be traveling full speed, with stops only for scheduled refueling and no other delays. The map below show the Trans-Siberian Railroad:"

Here is Hal Turner's report:
https://halturnerradioshow.com/index.php/en/news-page/world/breaking-news-china-deploying-troops-into-europe

It is clear that something is developing with the Chinese. Several more Chinese transport planes have been recognized on radar, and they are taking a zig-zag pattern in countries that are next to Ukraine.