Kaven the Hunter has appeared in various Spider-Man animated TV shows and video games, and his spear briefly appears during The Amazing Spider-Man 2 end credits.
Regardless, now that we know that Peter Parker will be hanging out in Europe for Spider-Man: Far From Home, throwing Kraven into the mix would make sense.
When his first attempt to kill Spider-Man fails, he teams up with Mysterio to get the job done.
It’s doubtful that Peter will venture into Russia during this movie, but it would be easy enough to set up a scenario where Kraven learns that Spider-Man is active on his continent from news reports covering either Web-Head dealing with the normal breed of criminals or his first encounter with Mysterio.