Ukraine is not asking for long range missiles to strike Moscow, they can and already have hit Moscow recently, even forcing a closure of the airport. There are also a few reports of military helicopters burning mysteriously in the area.
https://www.nbcnews.com/news/world/ukraine-launches-drone-attack-moscow-shutting-airports-rcna179485Ukraine launches 'massive attack' on Moscow, shutting down airports
But no, there are much more juicy targets that are worth billions and are better hit with ballistic missiles than drones (e.g. protected ammo depots and oil facilities).
There is not such a thing as a "point of no return" in population (other than having less than 100 couples of an species), you are making things up. Populations recover well and the Ukrainian army is made of relatively old soldiers in average.
But to the point: Trump has "promised" to end the war in 24 hours, let's take it as "in a short period of time". That is not possible unless both sides agree to stop the fight. While Ukraine would suffer if the US withdraws the aid, but the war would not be over.
For both sides to agree Putin will ask to keep what he got and take a chunk of additional free land. Zelensky may or may not settle with loosing what Ukraine already lost but he is unlikely to give away land.
But regardless of territorial concession from either side, the key for peace is a guarantee of an independent Ukraine. Any deal that means Ruzzia will recover and have all the incentives to attack again, with any of the usual excuses, a defenceless Ukraine is not going to be accepted by Ukraine - there is no benefit in allowing Ruzzia to re-arm and prepare better. Putin may have a similar view from the opposite side - any deal that means Ukraine is not held hostage to a Ruzzian invasion is not valid.
If it comes to brute forcing a solution it means that Ruzzia will have to keep pressing, with or without success for at least another year. That is doable, but it will also cut deep into the economy, the population and the future of Ruzzia. Even the regime may get scared.
As usual, Ukraine needs to make sure there are plenty of expensive and irreplaceable assets destroyed in Ruzzia daily, so that eventually the scale starts weighting more towards a peace in reasonable terms for Ukraine. One billion here in oil, half billion there in ammo, 100 million destroying planes,... etc. There is a lot to choose from and drones are not expensive.
And how exactly do you expect that Russian general, that's tasked with nuclear deterrence/retaliation watching the radar screen, to know if US ballistic missile with possible nuclear payload crossing the Russian boarder from Ukraine, with general trajectory towards Moscow will actually come down from space at some oil facilities before it reaches Moscow? I guess you expect him to know all possible trajectories that are crossing paths with St. Petersburg, Novosibirsk, Yekaterinburg, all RU nuclear cites, RU nuclear power plants, nuke early warning radars etc etc etc... Does anyone care to ask the rest of the world if they're ok with that? Stop playing dumb
Look at the
Median Age, Fertility etc if the goal is to get to 100 couples they're doing a good job.
Trump has lied and broken tons of promise before, so I wouldn't read much into his "promises". With that said, if he was serious about it he could just say that there will be no new aid for Ukraine, period, and that Ukraine has until January 21 to make the best deal it can. Then have backdoor talks with Russia decide on the compromise and pass to Ukraine what they should agree to. If Zelenskiy decided to ignore that, his inner circle and generals would quickly make Z understand that he's in no position to go against the will of US, and you're delusional if you think otherwise.
Anyone who has ever looked at the globe realizes that Russia is not in it for the territory. Russia cannot allow Ukraine to fall under US's sphere of influence. So securing Russia's influence, culture, granting Russian language official status in UA constitution... , and no NATO would take priority over square kilometers of land. i.e. agree for UA to hold the land for X years and then referendum, in return of putting Yanukovych (or someone like that) back in Kyiv.
Independent Ukraine is impossible, even Switzerland is not independent anymore. It must fall under some sphere of influence, and as we all see, Russia cannot allow Nuland's cookies in anymore.
Everyone realizes that Russia cannot hold on forever, just as everyone realizes that Russia doesn't have to as Ukraine would collapse socially, politically, and militarily way before Russia does. So continuing this is just an exercise in futility