Russia is urging aviation leaders gathering this week in Montreal, Canada to ease sanctions on spare parts and overflights, dismissing a largely global response to the war in Ukraine as "unlawful coercive measures," according to working papers and a source familiar with the matter, Reuters reports.

Russia made its request after the United States lifted sanctions on Belarusian state carrier Belavia last week that had been imposed following Minsk's support for Moscow in the war in Ukraine.

Russia is making a case to regulators and other delegates at the triennial assembly of the International Civil Aviation Organization (ICAO) which opens on Tuesday and runs through October 3.

The UN's ICAO sets global safety standards for civil aviation and its council has condemned Moscow for violating Ukraine's airspace sovereignty and its dual registration of aircraft.

"Unlawful coercive measures violate the human right to freedom of movement regardless of nationality and citizenship," one Russian paper said.

"The ICAO is required to take all practical measures to prevent states from applying politically biased discriminatory and coercive measures in the field of international civil aviation."

The documents also criticize the closure of 37 states' airspace to flight operations of Russian airlines and bans on aircraft maintenance and insurance.