Photos indicate Adrian Darya possibly preparing to unload oil, despite Tehran's assurances to UK it would not deliver cargo

Foreign Office summons Iranian ambassador for dressing-down, says recent moves by Islamic Republic 'designed to disrupt regional security'

UK accuses Tehran of selling 2.1 million barrels of crude oil on board Adrian Darya to 'brutal' Assad regime, violating international sanctions

Tehran says it's taking final steps to free Stena Impero, whose seizure was seen as a tit-for-tat move after Britain detained Iranian ship off Gibraltar

Adrian Darya 1 two nautical miles away from Tartus naval base after being hounded by Washington in weeks-long voyage across Mediterranean

Adrian Darya 1 turns off tracking beacon 45 nautical miles from port of Tartus, renewing speculation the vessel is delivering 2 million barrels of crude oil to Assad regime

Adrian Darya 1 slows to near-stop in eastern Mediterranean as US maintains Tehran-flagged vessel intends to sell crude oil to Assad regime

Treasury Department says ultimate beneficiary from sale of crude aboard Adrian Darya 1 is Iran's Quds Force, which will use proceeds to 'propagate terrorism'

US Secretary of State says Adrian Darya 1 headed to port of Tartus, calls UK decision to trust Iran 'a big mistake'

Sources tell Wall Street Journal ship will likely offload oil to smaller vessels headed for Arab sate -- despite assurances by Tehran and in violation of international sanctions