Friendly Fire in Ukraine - How Can a Patriot Shoot Down an F-16?

Aren’t there guardrails in place to ensure this doesn’t happen? Like Identification Friend or Foe (IFF) Interrogators?

A US Air Force F-16 Fighting Falcon “Triple Nickel” aircraft assigned to the 555th Expeditionary Fighter Squadron from Aviano Air Base, Italy, takes off from Bagram Air Field, Afghanistan, June 21, 2…