WASHINGTON — The Trump administration on Thursday issued more Iran-related sanctions, targeting 13 entities based in Hong Kong, China, the United Arab Emirates and the Marshall Islands, as well as eight vessels, the U.S. Treasury Department said.

The measures cover Greek national Antonios Margaritis and his network of companies and vessels that Treasury said was involved in transporting Iranian oil exports in violation of sanctions.

Treasury also designated Ares Shipping Limited in Hong Kong, Comford Management in the Marshall Islands and Hong Kong Hangshun Shipping Limited in Hong Kong.

Designated crude oil tankers include Panama-flagged vessels Adeline G and Kongm, and Lafit under the flag of Sao Tome and Principe.

The State Department separately said it imposed sanctions on two China-based operators of oil-related terminals and storage. It said they handled imports of Iranian oil aboard tankers previously targeted by U.S. sanctions.

Iran suspended talks with Washington aimed at curbing the Islamic Republic’s nuclear ambitions after the U.S. and Israel struck its nuclear sites in June. Iran denies any intent to develop atomic bombs.

Iran’s top diplomat said on Wednesday that the moment for “effective” nuclear talks with the United States has not yet arrived, adding that Iran would not completely cut off cooperation with the U.N. nuclear watchdog.

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(Reporting by Timothy Gardner and Ryan Patrick Jones; writing by Susan Heavey; Editing by Caitlin Webber and Cynthia Osterman)