Skopje, FYROM—The name dispute between Greece and the Former Yugoslav Republic of Macedonia (FYROM) enters its final mile.

A referendum will take place Sept. 30 to decide whether or not the Prespa Agreement between the two countries will be ratified. If the agreement receives the green-light from the citizens of FYROM, the country will change its name to North Macedonia. Then, the way will be open for the small Balkan country to enter the European Union (EU) and NATO.

Jens Stoltenberg, NATO’s Secretary-General, stated that the transatlantic military alliance won’t accept FYROM unless it resolves its name dispute with Greece. Stoltenberg, who is currently visiting the country, encouraged FYROM’s citizens to approve the deal.

President Donald Trump also encouraged FYROM’s citizens to end the deadlock. In a letter he said, “The Agreement and Macedonia’s membership in NATO will bolster security, stability, and prosperity throughout the entire region. The United States stands ready to support Macedonia, especially with respect to upcoming discussions on your membership in NATO.”