Vice President Dan Quayle discussed the Cambodian conflict Wednesday and impending U.S. retaliatory trade measures facing Thailand with Thai Prime Minister Chatichai Choonhavan, a government spokesman said.

Quayle's visit to Thailand was his fourth and final stop on an Asia-Pacific tour that also took him to Australia, Indonesia and Singapore.Quayle talked Wednesday with Chatichai, Foreign Minister Siddhi Savetsila and House Speaker Panja Kesomthong. The vice president and his wife, Marilyn, also were granted an audience with King Bhumibol Adulyadej and Queen Sirikit.

Thursday, he flies to Surin province, 212 miles east of Bangkok, to visit a refugee camp of Cambodians loyal to Prince Norodom Sihanouk, a former Cambodian ruler who leads a U.N.-recognized rebel coalition fighting the Hanoi-backed Phnom Penh regime.

Government spokesman Suvit Yodmanee said the discussions between Quayle and Chatichai centered on the search for a political solution to the decade-old Cambodian conflict and impending retaliatory trade measures facing Thailand under Section 301 of the U.S. Trade Act because of the country's failure to protect American intellectual property rights, especially drug patents.

During his stop in Singapore, Quayle warned Vietnam it could have no relationship with Washington unless it withdraws its troops from Cambodia as planned.

Quayle also called for Southeast Asia to unite with the United States under a military and economic "defense umbrella" by the year 2000.