No, the word you need is "Binational".
There is no such word as "intenational" . However, "international" means between nations. An internal flight is one that flies between two airports within one country, an international flight flies between airports of different countries.
The word you're looking for is "interstate," which means existing between states or involving two or more states.
Diplomacy is the conduct by government officials of negotiation and other relations between nations
Borderline
The Latin root word "inter" means "between" or "among." It is commonly used in English to indicate connections, interactions, or relationships between different things or groups.
International describes something that is applied to more than one nation. An example of international used in a sentence is: The UN is an international group in which many countries come together to solve global problems.
entente
In Latin "inter" means "between". The prefix "inter" is used in many words to mean variously between, across, or among. Words beginning "inter" usually describe a relationship between things - e.g. "international" - between nations, "interview" - a meeting between people.
international
The prefix of the word international is inter- which means between or among.
It is known as Contranatography.
In Latin the root gen- means (a) people, ethnic group, race, a breed. In English we have the words generation and genocide from this root. Note also ius gentium - the law of nations - international law.