While the SSJ100 and Il-114-300 airliners have received new orders, the new MC-21 model is struggling, prompting Russia's government to show its support.
Flight testing of a 737 Max is expected to start in China on August 11 with a view to allowing the airliner to resume commercial service in the country.
The Brazilian airline is replacing Boeing 737 NGs with the Max in order to cut operating costs and emissions, while also having more fleet flexibility.