Last week, Iran seized a South Korean oil tanker and its crew members in the Gulf, which it has continued to hold at an Iranian port. 

Last year, Iran similarly seized a British-flagged oil tanker and held it for months after one of its tankers was held off Gibraltar. 

Iran periodically holds military maneuvers in the Gulf waters and elsewhere in the country that it says aim to improve the readiness of its armed forces. Earlier on Tuesday, Iran held a massive drone-only drill coordinated across different points in the country.

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