Don’t know if this was the source, but I didn’t have any trouble finding info from the New York Times, 21 Jan 2023.
https://www.nytimes.com/2023/01/21/us/politics/us-troops-romania-ukraine.html
That link can’t be the source for “We just sent 5000 paratroopers to Romania.”.
That link only points out that about 4,000 regular troops have been there since last summer, not paratroopers.
“There are around 4,000 U.S. soldiers with the 101st Airborne Division who have been stationed at the air base since last summer”