He asked the Japanese government not to let their workers immigrate to America.
(the Americans also had Angel Island, which is where Asian immigrants were detained for questioning before they were allowed into America)
the Japanese occupation of Indochina.
The past tense of handle is handled.
relations with all of these countries were tense
Relations with all these countries were tense.
Handle
France
Why are U.S. - Iran relations so tense
The relations between Cuba and the US are tense due to it being declared as a communist country, by Castro, in 1961. The Bay of Pigs occurred in 1961, and the Cuban missile crisis occurred in 1962.
India
the Japanese occupation of Indochina. The Japanese occupation of French Indochina (after France had fallen to Germany) induced the United States to cut oil supplies to Japan, which in turn stimulated further Japanese aggression in order to secure oil and other supplies in Southeast Asia and the Pacific.
The teacher handled the troublesome children well.
Relations were difficult and often tense.