There is something going on more than the usual spring maneuvers in Russian occupied Ukraine.
The below from Der Spiegel is in Crimea ... so not an easy jump further in to mainland Ukrainian territory ... but ... still.
Moscow has been relocating military units near the Ukraine for weeks. Trains with tanks, howitzers and transporters are also rolling into the Crimea, annexed by Russia . A huge new army camp has arisen in the east of the Black Sea Peninsula, as satellite images available to SPIEGEL show.
About 30 kilometers from the town of Marfivka near the coast, the Russian military has gradually built a makeshift base, as this animation shows. If the area was still empty on March 15th, you will see more and more vehicles and bodies in the area until April 2nd:
... If you analyze the satellite image from April 13, there are more than a thousand military vehicles on the site, in addition to accommodation, in rows in fenced-off areas.:
Keep Ukraine in your scan the next six weeks or so.