The question of different forms of real and/or presumed mixed speech, a consequence of the interaction between Ukrainian and Russian and widely known as “Suržyk,” remains central in much of contemporary Ukrainian and, more widely, East Slavic sociolinguistic and language contact research. This article pursues a twofold aim: first, I intend to reaffirm my personal hypothesis on the formation process of this mixed speech, which has at times been cited without attribution in the scholarly literature. Second, the paper aims to examine the functioning of Ukrainian-Russian Suržyk within a broader sociolinguistic framework that takes into account other forms of language interaction. Ukrainian-Russian mixed speech in fact has to be assess...