The head of the NYPD sergeants union slammed Mayor de Blasio on Sunday for jetting off to Germany — and abandoning his leadership position in the Big Apple — as the city mo​urns Officer Miosotis Familia​, who was assassinated ​in a mobile police unit.

Anti-cop ten​s​ion has reached a “boiling point” and the mayor has done nothing to calm it, NYPD sergeants union president Ed Mullins ​told host John Catsimatidis ​on his ​AM-970 ​radio show ​”​The Cats Roundtable.​”​

“We’re not seeing any kind of leadership that comes out and explains… that the police are not your enemy; the police are not killing African Americans,” Mullins blasted.

“New York City is right now mourning the loss of a police officer who was dedicated to the City of New York, and we have our mayor who has just gone to Germany to join protesters. Is this the type of city we want to live in?” he said.

Familia, 48, was gunned down ​Wednesday ​by a cop-hating assassin as she sat in a police vehicle in the Bronx Wednesday.

“[Police] assassinations are very difficult to stop but what we can do to make a difference is kill the atmosphere that has been created across this country and in the city of New York,” he said. “We have a very anti-police atmosphere that is based on inaccurate facts and lies​.”

De ​B​lasio — who flew to Hamburg to join G-20 Summit protests a day after the officer​’​s shooting — should have st​ayed in New York and done more to address the tragedy, he added.

“Where we are failing is in political leadership,” ​Mullins said.