Government official says Athens 'very hopeful' court's move will lead to release of two Greek-flagged tankers seized by Tehran in retaliation last month

Incident last month came two days after Greece confirmed it would send Iranian oil from a Russian-flagged tanker to US in line with sanctions

Two-month UN-brokered truce between Iran-backed Houthis and Saudi-led coalition is set to end this week; supertanker Safer stranded off Yemen's coast since 2015 poses major threat

Secretary speaks with Greek counterpart, calls for immediate release of vessels captured days after Athens said it would deliver to US Iranian oil it seized from Russian tanker

Foreign ministry summons Swiss envoy, who represents American interests in Tehran, to lodge a diplomatic complaint against confiscation of vessel for reported sanctions violations

Massive investigation fails to find who leaked info on strikes against 12 vessels, mostly carrying oil, reported last year by Wall Street Journal; AG says no criminal investigation

Crew issues distress call on and seeks shelter in Tunisian waters from bad weather before going down in the Gulf of Gabes

Tehran says vessel has been emptied of oil cargo; ship suspected of trying to transfer sanctioned Iranian crude to Asia; vessel anchored in international waters; no details on crew

Iran has not acknowledged releasing the Vietnamese-flagged vessel, which it captured on October 24; Ship suspected of trying to transfer sanctioned Iranian crude oil to Asia

Capture of MV Sothys in Gulf of Oman has set off a diplomatic spat between Washington and Tehran, in the latest incident to cause maritime tensions in Mideast