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That sounds about right. Early on they were probably hoping for as little damage to them and the Ukrainians(who they would be ruling afterwards) as possible, now they shift to a more conventional approach.
Maybe, but they don't really need troops, they need equipment. The fact that they blocked men under 60 from leaving and now are asking for foreigners to help seems like they really want more men and as it's not men they lack in the first place that could be a worry. They might be relying on cannon fodder.