French Foreign Minister Jean-Yves Le Drian declared that his country "has nothing to learn" from Ramzan Kadyrov, head of Russia's Chechen Republic, after the latter insisted that France bears responsibility for the upbringing of the perpetrator of the May 12 knife attack in Paris.
His parents, now living in Paris, have been taken into custody as well as a friend in Strasbourg described as the "individual closest" to Azimov, according to a source close to the investigation.
Some 130 people were killed and scores more injured after ISIS gunmen and suicide bombers carried out a wave of coordinated attacks across Paris in November 2015, targeting a football stadium, a string of cafés and restaurants and the Bataclan concert hall.
Azimov became a French citizen in 2010 after his mother was naturalized, government spokesman Benjamin Griveaux told French television.
Prosecutor François Molins said the attack was being treated as terrorism.
French media report the victim killed in the attack was a 29-year-old man identified only by his first name, Ronan, who was living in the 13th district of Paris.
He rejected criticism from opponents of President Emmanuel Macron that the government was not doing enough to stem such attacks, saying: "Zero risk does not exist".
US President Donald Trump called for a change in mindset for how countries deal with terrorism while expressing sadness over the latest terrorist attack in Paris. France will not cede to the "enemies of freedom", he tweeted.
He was then shot by the officers.
A picture seen by Reuters showed a bare-chested and bearded young man dressed in black sweatpants lying on the ground and being helped by emergency services.
"I was having a drink with friends and we heard a boom", a witness named Gloria, who had been in a nearby bar, recounted on Saturday night. "The street was just filled with police and firemen and they tried to revive him (the attacker)".
Two people are dead and several injured in a knife attack in Paris, France.