Not sure if they knew it was Russian or if it was joke. However, CPAC workers began to collecting the flags from the attendees.
Crowd at CPAC waving these little pro-Trump flags that look exactly like the Russian flag. Staffers quickly come around to confiscate them. pic.twitter.com/YhPpkwFCNc— Peter Hamby (@PeterHamby) February 24, 2017
Here a tweet of the guy passing them out
Snapchat's CPAC story caught video of the guy handing out the Russian Trump flags pic.twitter.com/P3lXV5IdIE— Peter Hamby (@PeterHamby) February 24, 2017
The gag is most of the attendees didn't know it was a Russian flag