You can enter into the business agreement with proposed company at abroad with the conditions and clauses that they would not enter into direct contract or any business agreement with the clients through whom you would promote the business intended to be carried out through the current business agreement.
You may also impose clause that the company with you are entering into agreement shall have no access to retain merchandising i.e., your clients or customers directly or indirectly since the details are your company's property.
This clause is applicable during the currency of your business agreement with that company and any breach of this condition ,may attract legal action including compensation for estimated loss and breach of contract.
You can even enter into mutual confidentiality agreement with the foreign company in this regard with conditions favoring both sides in case of breach of contract by either side.
You can consult an expert attorney to draft such agreement with carefully chosen words to protect your business and future interest.