South Korean tanker was boarded by armed Iran Guard forces

In this undated photo released on Tuesday, Jan. 5, 2021, by Iranian Army, drones are displayed prior to a drill, Iran. The Iranian military on Tuesday began a wide-ranging, two-day aerial drill in the country's north, state media reported, featuring combat and surveillance unmanned aircraft, as well as naval drones dispatched from vessels in Iran's southern waters. (Iranian Army via AP)

In this photo released Monday, Jan. 4, 2021, by Tasnim News Agency, a seized South Korean-flagged tanker is escorted by Iranian Revolutionary Guard boats on the Persian Gulf. Iranian state television acknowledged that Tehran seized the oil tanker in the Strait of Hormuz. The report on Monday alleged the MT Hankuk Chemi had been stopped by Iranian authorities over alleged “oil pollution” in the Persian Gulf and the strait. (Tasnim News Agency via AP)

In this undated photo released on Monday, Jan. 4, 2021, by Iranian Army, drones are displayed ahead of a drill, Iran. The Iranian military on Tuesday, Jan. 5. 2021 began a wide-ranging, two-day aerial drill in the country's north, state media reported, featuring combat and surveillance unmanned aircraft, as well as naval drones dispatched from vessels in Iran's southern waters. (Iranian Army via AP)

In this photo released Tuesday, Jan. 5, 2021 by the Iranian army, Chief of the General Staff of the Armed Forces Gen. Mohammad Hossein Bagheri, center, listens to an explanation while visiting at a display of drones prior to a drill, Iran. The Iranian military on Tuesday began a wide-ranging, two-day aerial drill in the country's north, state media reported, featuring combat and surveillance unmanned aircraft, as well as naval drones dispatched from vessels in Iran's southern waters. (Iranian Army via AP)

In this photo released Monday, Jan. 4, 2021, by Tasnim News Agency, the MT Hankuk Chemi, a South Korean-flagged tanker is escorted by Iranian Revolutionary Guard boats on the Persian Gulf. Iranian state television acknowledged that Tehran seized the oil tanker in the Strait of Hormuz. The report on Monday alleged the MT Hankuk Chemi had been stopped by Iranian authorities over alleged “oil pollution” in the Persian Gulf and the strait. (Tasnim News Agency via AP)

In this photo released Monday, Jan. 4, 2021, by Tasnim News Agency, the MT Hankuk Chemi, a South Korean-flagged tanker is escorted by Iranian Revolutionary Guard boats on the Persian Gulf. Iranian state television acknowledged that Tehran seized the oil tanker in the Strait of Hormuz. The report on Monday alleged the MT Hankuk Chemi had been stopped by Iranian authorities over alleged “oil pollution” in the Persian Gulf and the strait. (Tasnim News Agency via AP)

In this photo released on Tuesday, Jan. 5, 2021 by the Iranian army, drones are displayed prior to a drill, in an undisclosed location in Iran. The Iranian military began a wide-ranging, two-day aerial rill in the country's north, state media reported, featuring combat and surveillance unmanned aircraft, as well as naval drones dispatched from vessels in Iran's southern waters. (Iranian Army via AP)