Read this: In the Southern Russian dialects, instances of unstressed /e/ and /a/ following palatalized consonants and preceding a stressed syllable are not reduced to [] (as occurs in the Moscow dialect), being instead pronounced [a] in such positions (e.g. is pronounced [nasli], not [nsli]) this is called yakanye/. Consonants include a fricative //, a semivowel /w~u/ and /x~xv~xw/, whereas the Standard and Northern dialects have the consonants //, /v/, and final /l/ and /f/, respectively. The morphology features a palatalized final /t/ in 3rd person forms of verbs (this is unpalatalized in the Standard and Northern dialects). Some of these features such as akanye/yakanye, a debuccalized or lenited //, a semivowel /w~u/ and palatalized final /t/ in 3rd person forms of verbs are also present in modern Belarusian and some dialects of Ukrainian (Eastern Polesian), indicating a linguistic continuum.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What does Southern Russian have a linguistic continuum with?
modern Belarusian and some dialects of Ukrainian (Eastern Polesian)