this excerpt from In Other Words (the same source!?) gives a narrower definition.

razbliuto
The confusing bundle of emotions felt by Russian males for their ex-girlfriends.

http://www.wordswithoutborders.org/article.php?lab=InOtherWords

likewise "They Have A Word For It," by Howard Rheingold
razbliuto: the feeling that Russian men have for their old girlfriends