Pictures don’t seem to correspond to a Kalibr (because with a 400 to 500 kg warhead, that tractor would have been vaporized, and it also would’ve left a much bigger crater).
Possibly a remnant of an S-300 (which is an air defense system used by both Russia and Ukraine), but the particular provenance is still inconclusive.
Given what some Ukrainian Telegram channels are saying, it’s possibly a remnant of a Ukrainian S-300 that intercepted a Russian cruise missile, with the debris from both landing across the Polish border.
(Your Mileage May Vary, for what it’s worth.)
First Uke telegram channels and now Russians too say it was indeed an S-300 (Ukrainian), specifically from Air defense regiment #540 in Lvov area, Ukraine.
This of course does not remove the possibility of WWIII so desired by the Demented.
Ukrainian s300 gone astray. My wild speculation.
Many have previously.
You’re the first one in all these thread who noticed key point of explosion/warhead size...
S-300 was old Soviet missile being used by Ukraine to lob at actual Russian missiles. Lets hope a very honest report involving all parties happens to avert an escalation.
Be very careful, we don’t want dead US troops.