Pan Asian
Why would Russia want that? They made clear exactly what they want over the weekend and that is a Federal structure in which the regions have a very high degree of autonomy to include external agreements. This really means a Ukraine that exists in little more than name only and one where many regions may indeed have similar referendums regarding joining the Russian federation.
Not wishing to sound immodest, but I did pretty much predict the course of events and the arguments prior to the Kerry Lavrov meeting over the weekend in post 767.
Lavrov has demanded a looser federal system
Kerry has said that this is something for Russia to sort out with the Ukrainians directly (washing his hands of the problem)
The Kiev regime have indeed replied "why should we agree to this, it is a demand for capitulation"
The key part of the quotes sentence you replied too, was about the when and the method used.
Russia would happily gain its objectives through diplomatic arrangement, but still has the option of an R2P intervention if called upon to use it.
Unfortunately, ten years of agitation and counter agitation to try and remove the Russian presence from The Crimea has polarised and now fractured the unity of the Ukraine nation beyond repair. Now, with the Crimea gone, there is absolutely no incentive for any Western nations to try put Humpty Dumpty back together again.
Removing Russia from the Crimea would be a bonus but having even just western Ukraine solidly move towards, never mind joining - which is what is going to happen, NATO's (US+Western Europe's) orbit is a solid win. Ukraine's potential as a base for ABM and other aerospace weapons deployment matter more than MBT-style ground forces or naval presence. And because Russia had all of Ukraine in its orbit before, anything less than that is a loss for Russia, which is what this is.
Ukraine may still be one country in name only but technicalities are important. In allowing this Russia is avoiding setting itself up for a repeat of being told to "tear down this wall", making any Westward re-alignment moves by an "intact" Ukraine as potentially slow and controversially "undemocratic" as possible, and importantly not having Russia officially expand.
I can't pat myself on the back yet since I had predicted the Ukraine situation to turn into a Korean War style conflagration if both sides decide to fight it out but so far everyone seems to be pulling their punches. At this stage the Ukraine will probably share an evolution similar to that of the situation in Vietnam leading up to the Vietnam War.