I believe Russia, China, Brasil and Canada have not signed up to the Chicago Convention and these countries continue to have complete control over which flights enter, or overfly, their territorial airspace. Given the current poor state of relations between the UK and Russian governments, will direct flights from UK airports to destinations in China, Japan and South Korea be banned by Russia when the UK ceases to be a EU member state? If so, it would have a severe impact on air freight as well as air passenger traffic. Sorry for the slight thread drift.