Looking at this from the perspective of previous ops by various actors.
US in Haiti 1994
Russia in Ukraine 2022
US in Venezuela: 2026
Elected president
Haiti: Yes, the US restored the popularly elected president to power.
Ukraine: No. Russia had a Quisling standing by, but no one seriously doubts Zelensky won the more recent presidential election in Ukraine.
Venezuela: Maybe. The US is "cooperating" with Maduro's VP, but there is an elected president standing by.
Fighters?
Haiti: When it comes to fighting, Haitians are sheep. No fight in them at all.
Ukraine: Ukrainians are obviously fighters. Invade Ukraine and expect a fight.
Venezuela: There was evidently some fight in the Venezuelans, but not much. Plus, they got some dodgy gear and had not maintained it.
Resources
Haiti: Haiti has no resources whatsoever.
Ukraine: Ukraine has limited resources. Agricultural products I suppose. Plus transit for Russian oil and gas.
Venezuela: Obviously, Venezuela has oil, but the lack of maintenance over the last decade or two has seen the oil infrastructure decay badly.
Political objectives?
Haiti: Stop Haitians from coming to the US and give the US an excuse to send asylum seekers home.
Ukraine: Get a pro-Kremlin regime in power in Kyiv so Russia will have another buffer state between NATO and Russia proper.
Venezuela: limit Chinese & Russian influence in Venezuela, begin to get Venezuelan oil infrastructure back on line, make sure every world leader tolerating (or conducting) drug trafficking from his territory knows that this behavior comes with very real person risk.
Handover to whatever is next
Haiti: Haiti quickly devolved into what Haiti has been for two centuries, a mess. Now, a fellow named "Barbecue" is the head of state, such as it is.
Ukraine: I suppose Putin thought he could install his pro-Kremlin puppet and then
Venezuela: It appears to me that currently Maduro's VP is the head of state, but I would bet the US has told her to mind her Ps and Qs and hold elections in the near future. This is one place in which UN election poll watchers might be a great assistance. I do not know what US forces will be on the ground to force good behavior. Maduro handed out a alot of AKs to his people, so a lot of American boots on the ground means risk that one of Maduro's people will decide to take a pot-shot at them. No American boots on the ground means no risk, but it also means limited pressure against Maduro's VP to act the way we want her to. A lot of boots on the ground means compliance by the head of state, but it also means more risk of American casualties.