The country of Battala wants exclusive rights to purchase all graphite from Myca because it wants to develop its own solar battery.
Battala offers to pay more than the United States. You hear from U.S. companies that they fear losing access to graphite if Myca were to break its existing contract with the United States.
To deter Myca from breaking its contracts you can threaten to stop issuing travel visas. This would anger Mycans impacted by the hurricane and who want to be with families in the United States while Myca recovers from the crisis.
On the other hand, U.S. companies don’t want to trade with corrupt regimes, and corruption is a serious problem in Myca. You could offer to fund international NGOs to develop anti-corruption rules for Mycan government officials. This could incentivize, or encourage, Myca to remain within your existing trade agreements and encourage other foreign investments.