I wouldn’t put it past the Ukrainians to put one in the middle of the Kremlin, although I wouldn’t advise it.
Russia is pulling back and will wait for the starvation and freezing cold feels to the EU and the Ukes. That will have the Ukrainians BEGGING to be let into the Russia fold once more.
It is what I would do. If they wanted to do that, all they would have to do is put some incendiary bombs into the crops, to lower the yield, and ‘voila.
One what? They have no nukes — Ukraine gave them all up in return for protection to be provided by (according to the agreement) the US, the UK, and... Russia.
Arguably, if Ukraine had kept a few of those nukes, Russia would have behaved toward them. But, at the time I don’t think even the Ukies completely trusted a future Ukrainian government with nukes, and they did trust in the assurances given them of protection.