The same sort of informal, secretive network of asset transfers has developed among the Russian oligarchs, according to one expert.

In order to put pressure on the Russian president, sanctions were imposed on people with ties to him.

Some of the world's richest people have had their assets frozen. There was an increase in asset transfers a few months before Russia invaded Ukraine.

A financial-crimes expert and CEO of Elucidate, which analyzes patterns in money movement, said that the sanction of an individual is different to that of Osama bin Laden. The legal framework that is used is the same as this one.

It is a fast-track mechanism for creating alternative payment platforms if we look at how transactions are moving and the reallocation of resources and assets.

Outside of traditional banking systems, there are alternative money- moving networks. It's an ideal method of financing terrorism because no documentation is required.

It took a long time to develop hawalas. The same as for proxy entities, they're going to put in place a tactical mechanism to allow us to circumvent sanctions.

Evan Bayh, an Indiana senator, said that bin Laden used the underground financing system to avoid being stopped.

"One system which bin Laden and his terrorist cells use to covertly move funds around the world is through hawalas, an ancient and formerly known system of transferring money," Bayh said.

Congress passed a law requiring check-cashing businesses and informal financial enterprises to register with the government in 1994. The law didn't have a big impact on hawalas.

In the aftermath of September 11, we have learned that Osama bin Laden's terrorist network exploited vulnerabilities in the regulatory and enforcement procedures in the formal financial system, as well as using the informal system to move significant amounts of cash around.

Sarbanes said that the system's anonymity and lack of legal record-keeping made it an attractive mechanism for drug traffickers, weapons brokers, tax evaders, corrupt officials and terrorists.

Sanctions against Osama bin Laden

Terrorists, including bin Laden and members of Al Qaeda, were targeted for trying to draw the US into a large-scale war in the Muslim world that would overthrow the existing world order.

The US intelligence and law-enforcement agencies warned senior government officials of an increasing threat to their lives.

Bin Laden declared a jihad against the US in 1996, leading to attacks on American interests in other countries. A strike on the US would convince the government to leave the Muslim world.

The reason why the sanctions were imposed in the first place is the only difference between the two.

The Office of Foreign Assets Control in the US and the HMT in the UK are the same agency.

"If I knew that there was a legal regime that would prevent me from doing business, and I knew that there was an informal regime that would allow me to circumvent that, why wouldn't I?"