You saw a P in Cyrillic - it actually means R
I don't know about your other examples, but there's also the letter rho (Skyrim jokes, anyone?) in the Greek alphabet which looks like a latin P. And the Greek alphabet is derived from the Phoenician one where you can find the letter rosh which is a vertically mirrored P.
Now the Phoenician alphabet is there since the 11th century BC, the Greek one since the 8th. The Latin one was created in the 7th century BC probably brought to Rome by greek colonies in Southern Italy.
So if you want to argue like that, it's not the Russians, Greeks or Phoenicians who screwed it up, it's the Romans who messed up the alphabet (probably when they found out how to make wine).
But the real question would be: Is it the right version if it is there first or are the changes from the first versions improvments?
Or to continue this long combo from before: GreekAlphabet 0.5 has an update available. Do you wish to update to RomanAlphabet 0.1? *yes* *get lost* *I'm too drunk to hit 'get lost' and therefore ended up here*