"France shares Britain's assessment that there is no other plausible explanation and reiterates its solidarity with his ally," Macron's office said.
French President Emmanuel Macron's approval rating has fallen below 50% to its lowest level since October last year, a poll showed on Sunday, as the government pushes ahead with plans to shake up France's costly civil service.
The potential A320 order, which had not been previously announced, would be worth more than $18bn at list prices.
French President Emmanuel Macron urged Europe on Monday to take part in China's Silk Road revival plan, despite some European misgivings about the massive project, as he began a state visit.
French President Emmanuel Macron will on Tuesday urge wealthy countries and global companies to commit more funds to combating global warming and help poorer nations deal with the impact of climate change.
Emmanuel Macron said the decision should not "add to the instability of the region. I'm issuing a call for calm and responsibility by everyone which is essential for the efforts we are undertaking here."
French President Emmanuel Macron called on Saturday for dialogue in Iraq between the central government in Baghdad and the semi-autonomous Kurdistan Regional Government (KRG) within the framework of the Iraqi constitution.
President Emmanuel Macron has invited Lebanon's Saad al-Hariri and his family to France, the French presidency said in a statement.
His Highness the Emir Sheikh Tamim bin Hamad al-Thani discussed with French President Emmanuel Macron the strong bilateral relations and means of enhancing and developing them in all fields to serve the common interests of the two countries.