Donald Trump’s first meeting as president-elect with a head of state will be closely scrutinized for both style and substance.

Japanese Prime Minister Shinzo Abe took the initiative to be the first to meet with Trump for practical reasons. During the election campaign, Trump criticized Japan for its trade practices and for how much it was paying the U.S. for its defense. Abe wants to understand the level of Trump’s commitment to defend Japan. He wants to, in his words, “build trust” with incoming U.S. president and highlight the importance of strong relations between the countries.

Trump needs to get used to seeing Abe. New rules will allow Abe to run for a third term, which means he will likely lead Japan throughout Trump’s first term. How the two leaders get along will speak volumes about how Trump deals with fellow world leaders — and how they might deal with him.