The UK has been considering sanctions against Russia over Ukraine but Foreign Secretary Liz Truss has told the BBC "there have been issues in the past with illicit finance in London, which we are clearing up". Why is it difficult to tackle the issue?

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How much Russian money is there in the UK?
Many wealthy individuals and companies from Russia and around the world invest legitimately in UK financial and property markets.

But the anti-corruption organisation Transparency International has identified more than £5bn of property bought in the UK with what it says is "suspicious wealth", one-fifth of which has come from Russia.

A Home Office report says the UK has seen "a significant volume of Russian, or Russian-linked illicit finance", which is spent on things like luxury property, cars and school fees, and sometimes as donations to cultural institutions, which allow individuals to "launder their reputation".

When it comes to property, which can be owned through companies rather than in the names of individuals, information sometimes does not come easily. The Overseas Company Ownership database for England and Wales says only four of 94,000 properties where the registered legal owner is an overseas company, are listed as being owned by Russian companies.

Why is the UK attractive to Russian investors?
London has long been a popular destination for wealthy Russians to settle in, or to purchase property and investments.

The UK's "golden visa" - Tier 1 (Investor) visa scheme - offers residency to those rich enough to invest £2m or more in the UK, and allows their families to join them.

This scheme is expected to be scrapped by the government shortly amid pressure over UK links to Russia.

The Home Office has issued 2,581 investor visas to Russian citizens since the scheme was introduced in 2008.