but then you DO NOT engage in further engagements with company B (PERIOD).
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You CANNOT be in negotiations AND accusations against the directors of company B.
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If you have firm belief, then you it will be wasted until you stop accusing the other party and especially its board of directors.
There are certain negative things that you never bring out in the open, WhILE negotiations are ON.
And you only air the dirty laundry when you have decided to NOT plan a product sharing with the company B.
These are some very basic principles of engagement, that are applicable to individuals, companies, and countries.