Ok, while I still remember (maybe I should wait for the implementation of the Dvina)
In mid-80s, a friend of mine told me a joke. Not very politically correct

"The Vietnamese received several SAM systems from the Soviets.
After a few days, the Vietnamese send a message:
'Dear Comrades! Thank you very much for the surface-to-air missiles!
Now please send us some surface-to-aircraft missiles'."

LOL