The introduction of legislation comes after transport secretary Grant Shapps wrote to UK ports on Monday and “asked” them to take steps to prevent access to Russian vessels.
Tyrrell said the letter had put port operators in a difficult position, since they were not – at that stage – legally entitled to prevent access due to their open port duty.
The new legislation overrides the open access duty, which Tyrrell said is helpful, but he identified remaining challenges for port operators to address.
“The UK has put in place strict measures to ban Russian vessels from UK ports, but the breadth of this new legislation presents some difficult challenges for harbour authorities up and down the country,” Tyrrell said.
“The ban extends to ‘ships owned, part-owned, controlled, chartered or operated by persons connected with Russia’, which is extremely broad and is likely to prove very hard for a harbour authority to identify. That would include circumstances where someone ordinarily resident in Russia has any beneficial interest in the ship or a share of the ship, no matter how small. Under the legislation, it is a criminal offence to allow access to such a ship so the crucial factor will be whether the harbour authority has ‘reasonable cause to suspect’ such a beneficial interest in the ship or share in the ship to refuse access,” Tyrrell said.
“Although the government has said that they will support UK ports in identifying relevant ships, other than simply relying on information provided by the shipping agents, who themselves may not know, it is difficult to see what else the harbour authorities can do,” Tyrrell said.
In a statement issued on Wednesday, Shapps said: “Putin and his allies must feel the full consequences of their vicious and illegal invasion of Ukraine. That’s why from today, I’m instructing all UK ports to turn away any vessel that is flagged, registered, owned, or operated by Russia. By banning Russian ships from our ports, we are further isolating Russia and crushing its economic capabilities, starving Putin’s war machine.