The UK has made moves to stop a cargo vessel allegedly carrying refurbished Russian-made attack helicopters from completing its journey to Syria.
The MV Alaed had its insurance withdrawn by The Standard Club in London while it was about 50 miles off the north coast of Scotland.
The insurer said it had sought more information on the boat's cargo.
Withdrawal of insurance prevents the MV Alaed from sailing until its owner can secure new cover.
It is thought that the vessel has stopped off the Western Isles.
The Foreign and Commonwealth Office (FCO) said it was unclear where the vessel would now go.
The Russian embassy in London has not yet commented.
The UK and US have raised concerns with Russia about shipments of weapons to Syria, which is subject to a European Union arms embargo.
In a statement, the FCO said: "We are aware of a ship carrying a consignment of refurbished Russian-made attack helicopters heading to Syria.
"The foreign secretary made clear to Russian Foreign Minister Lavrov when they met on 14 June that all defence shipments to Syria must stop.
"We are working closely with international partners to ensure that we are doing all we can to stop the Syrian regime's ability to slaughter civilians being reinforced through assistance from other countries."
The Standard Club said it believed the MV Alaed had stopped off the coast of the Western Isles.
In a statement, it said: "We were informed on Friday evening that the ship might be carrying weapons, in particular attack helicopters, missiles and non-specific munitions, and we are making inquiries to establish what their side of the story is.
"There are exclusion clauses in our cover and, for anyone involved in improper or unlawful trade, we can cancel cover.
"We are investigating whether or not to do so in this case."
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