My expectation would be that we'll see one within the next couple of months. It looks like Russia is already doing offensive operations all across the front, and one likely reason is that they're probing to see where the weak spots are. The front around Avdievka looks to be collapsing right now, so we might see a major push there. Another big factor is the deadlock in US over funding. If the money doesn't get passed in the next few days, then Ukraine likely won't see anything till the end of January at the earliest. This seems to be a good window of opportunity for Russia to exploit.