All of them spent the last 4 years shitting on Trump collectively lol. Zelensky included. Trump will obviously not let it go considering his unending ego.
As cringe as it is, making a public display of kissing Trump's ass will probably pay dividends and costs him nothing(besides dignity). He'll pay no price from Dem politicians for as long as he's willing to send his citizens into the meatgrinder on behalf of Raytheon.
$10 bucks says that when the U.S. media ask Trump why he cut off aid to Ukraine, Trump won't be able to make at least one dig at Zelenskyy being short.
He won't, he'll rebrand doing the same thing but based, just like how Obama handled continuity in iraq/Afghanistan. The war in ukraine is valuable to the US state and corporate interests as a bulwark against Europe being friendly with Russia