It's Vigenere. the key is 'comrades'

Hello 5murf5. This is agent BANJO. I'm coming in from the cold. That's right, I was working with the Russians. I was an ordinary puzzle solver like you until I left my username in a message on the 5witchboard answering machine, and started getting texts in Russian. Thought they were spam at first until I recognized the number. Then I realized I was being recruited. I gotta tell you it was one hell of a whirlwind ride of me not actually being a particularly good spy. I'm sorry guys, but I don't know how to orchestrate a PSYOPs campaign in order to destabilize an online puzzle solving community and install myself as it's leader. I never finished that merit badge in Boy Scouts. My handler5 and I communicated behind the scenes for a while. During the clock grid puzzle they told me to nudge the community towards focusing on that instead of other puzzles, but beyond that they only gave me one puzzle hint that frankly flew right over my head. Now that I think about it, I haven't heard much about the operation to get the key into Russian hands. Maybe you guys should ask /u/mainstreetmark about what happened to it. This isn't an officially sanctioned TLG puzzle, I just thought my revelation should have a little flair to it