Not from Ukraine though. Neither side wants war, and since the Cuban Missile Crisis, both sides have learnt the dangers of brinkmanship.
A Russian invasion of a poor Eastern European, ex-soviet country, with Western-backed military opposition... Change a few things around, and this would be a pretty average Cold War conflict. Think Korea, Vietnam, Afghanistan.
We didn't have WW3 then, with much higher tensions. We won't now.
The US is being forced by two reinforcing doctrines, the Wolfowitz Doctrine and the Thucydides Trap, to try to prevent China becoming the 'Number One' country in the next few years. China just has to keep growing its GDP as normal, at a higher rate than the US's GDP growth, to become 'Number One' very soon. It's an arithmetical certainty that China will come out on top. And that crossover-point is around 2025.
The US needs to initiate a conflict about 5 years before the crossover-point to be certain of winning that war. China needs to hold off any war until after the crossover point, in effect to 'turn the other cheek' to US provocations while the China grows and the US declines in relative terms.
Note that I said above that the US needs to initiate the conflict about 5 years before the crossover-point. That date is now two years in the past, the US should have started that war back in 2020. It's very likely that the US has 'missed the bus'. It might start the war now, but its chances of coming out on top now are very much diminished, due to those two years of lost opportunity.
China does NOT want a war now, because a war now would only get in the way and would only slow down China's climb to the top. If China starts anything it would only be 3-5 years after the crossover-point, say after 2028. By then the US will be very much 'Number Two' on the ladder.