Why wouldn't they make a bunch of fake planes? Or park a bunch of decommissioned planes somewhere that looks like a valuable target but is worthless?
Fake materiel has been a good strategy to draw enemy fire for a long time. It was used in WWII, with inflatable armor mockups used to draw enemy bombardment, and also by the Iraqis in the Gulf War, where they used an old Hilux with a 44gal drum with some fuel in it to simulate a mobile rocket launch. This would then trigger a retaliatory missile from the Americans, so, for the cost of a busted old ute and a few liters of fuel, you could cause your opponent to fire off a missile worth hundreds of thousands if not millions of dollars. However, the Iraqis failed to realize that the US MIC don't care how much money they spend, in fact, the more the better for them.
One story I heard only recently happened during WWII, I don't know if it is true or not, so I don't claim it either way, but it is entertaining.
The Germans were building a bunch of wooden decoy planes to try and get the allied forces to waste bombs on them. Allied spies discovered that they were fakes and their response was to fly a mission over the fakes and drop a single wooden bomb.
Imagery from multiple angles will rapidly ID them.
Plot twist, they are probably doing exactly that. This is to make US/NATO think these are high value but they are already decommissioned and are now being used as "bullet sponges".
Russia has a long history of tricking the US into expensive and stupid ploys. At one point they had something like 10 next-gen bombers (this was back in the 80's-90's) that they knew "American" spotters lived near the air base. Every single night they would repaint the tail numbers. This made the US think they had something like 80+ of these bombers when they really only had about 10.
Now, they are forcing American resources to re-train image-seeking weapons to try to see if a parked aircraft on the ground with tires on it is actually a useful target to attack. They could just start painting outlines of a aircraft on the ground and putting a bunch of tires on it and the missiles would then decide that the painting is worth attacking.