That is a possibility. Some time ago, a source familar with the region told me that Milosevic made a grave mistake by siding with the attempted military coup leaders that tried to oust Gorbachev in 1989 or 90 (I do not recall the exact date). Clearly Milosevic gambled hoping to win support of what he saw as future leadership in Moscow, but he miscalcuated. That coup was thwarted by forces led by Yeltsin and that explains the animosity between the two men. I hear that there is considerable dissatisfaction with Milosevic inside Russia - many Russians believe that Milosevic's uncompromising stance jeopardizes the fine line Russia tries to walk in the times of her weakness.
But I also think that Russians would be fools if they let the US to continue with its terror bombings - because that would demonstrate the clear inferiority of Russian-made hardware, if not for other reasons. A few downed F-16 (according to Russian sources, the Serbs already downed 2 NATO planes) could restore the reputation of Russian-made weapons and thus boost future sales.