The information portal "Indeksonline.net" published yesterday (November 28) an article titled "Serbian helicopters flew near the border with Kosovo today (video)".
Attached to this article is a video showing footage of two helicopters flying. (see archived) here)
After checking and verifying the facts conducted by hibrid.info, using the "Google Maps" platform, it has been confirmed that the footage was shot at a distance of nearly 60 kilometers as the crow flies from the border with Kosovo.
Link to the post published on Facebook by the portal "Indeksonline.net":

In this video, at the 11th second, a road sign appears on the A1 highway in Serbia, which displays the names of several settlements in that country, and their distance from the location where the video was shot.
The table shows that the nearest settlement is Doljevac (12 km), while the furthest settlement is Vranje (102 km). (see photo below)

Based on the table above showing the distances between the aforementioned settlements, hibrid.info has managed to find the location where the video may have been shot (via Google Maps).here) showing two helicopters. ((see photo below)

Using the distance from where the video was shot, hibrid.info has measured from this location to the closest point on the border line with Kosovo, resulting in a distance of 54.86 kilometers as the crow flies. (see photo below)

Analyze:
Based on fact-checking and verification, hibrid.info has confirmed that the claim made by the "Indeksonline.net" portal, that "Serbian helicopters flew near the border with Kosovo today", is untrue.
The video footage was shot at a distance of nearly 60 kilometers as the crow flies from the closest border line with Kosovo.
Based on its work methodology, hibrid.info assesses this publication as "Unverified Content" and "Disinformation".
Reasoning:
The "Unverified" rating is given to those informative contents that do not provide sufficient information to confirm the claims made in the report, and which could not be verified due to certain circumstances (speed, lack of sources) during the publication of the content.
"Disinformation" is defined as information content that contains a "mix" of inaccurate sources or even half-truthful attributes, and that is created and/or distributed with the deliberate intention of causing harm. The motive behind the producers/distributors of disinformation content lies in achieving a political, financial, psychological or social goal.