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закулисные переговоры stresses
gen.	back room; backstage negotiations; secret talks; behind-the-scenes negotiations (Alexey Lebedev); back-room (и т.п.); backstage talks; back-room
law	secret negotiations
Makarov.	off-stage talks
mil.	negotiations behind the scene
polit.	backchannel negotiations (Андрей Уманец); backchannel talks (Андрей Уманец)
slang	smoke-filled room

закулисные переговоры: 8 phrases in 5 subjects

American usage, not spelling	1
Business	1
Diplomacy	3
Economy	1
General	2