The incident erupted as he was talking to other guests, when the attacker apparently "went ballistic".
This didn't fly with Bieber - who himself has had a few run-ins with the law - so he intervened and "punched the guy in the face and threw him against the wall", allowing the distressed woman to break free.
Russian Federation warns of war over Syria strikes
US Defence Secretary Jim Mattis said the strikes were a "one-time shot" and that no additional airstrikes were now planned. Russia vetoed a USA text, while two Russian-drafted resolutions failed to get a minimum nine votes to pass.
While at a Coachella Music Festival party on Sunday, April 15, the pop star came to the defense of a woman who was being assaulted by her former boyfriend.
Whatever the connection, the guy suddenly grabbed the woman by the throat and wouldn't let go. When he refused to listen Bieber allegedly punched him in the face and pushed him against a wall, causing him to lose his grip on the woman's throat.
Haley Warns US, Allies 'Locked and Loaded' to Strike Syria Again
Russian President Vladimir Putin severely condemned the attacks saying that the strikes violate the UN Charter and global law. Meanwhile, Russia's defense ministry said Saturday the Western strikes claimed no victims among Syrian civilians or military.
Eyewitnesses say the guy was grabbing the woman by the throat when Justin and his pals screamed at the guy to let her go.
As a result, the perpetrator in question was thrown out of the party a short time later. Sources also claim that the man was seen outside the party screaming obscenities and physically attacking an SUV he believed contained Bieber. The man, who was not named in the report, was seen screaming Bieber's name and trying to hit the vehicle.
Comey: Assumption of Clinton victory factored into email probe announcement
Moscow has repeatedly denied that it interfered in the 2016 campaign in hopes of tilting the election in Trump's favor. In January 2017, USA intelligence chiefs briefed Trump and his advisers on Russia's election meddling.
Local police officers arrested him later that evening.