quoting dhok, Priest, Norman, United States:

quoting hwhatting, Disinterest:

No vowel harmony? I mean, come on, it's surrounded by Finno-Ugrics... ;-)

So was Slavic-

No, in its formative period, it wasn't. It had Iranian languages to the South, some Germanic adstrate, and to the North, Baltic languages; Baltic toponymy is attested as far East as Moscow and these (lost) Baltic languages formed a cordon that separated Slavic from Finno-Ugric until the northward expansion of Eastern Slavic (IIRC, during the 6th/7th century AD).
That said, I was joking; there's no law saying that a language surrounded by languages with vowel harmony has to acquire that feature. Just would have been an interesting and plausible development under the circumstances. :-)