John Kerry is at anti-corruption summit in London, dealing with issues like eliminating tax havens

[karynnj]

2. A goal for next year's summit is to recover money for nation's stolen by past leaders

The Global Forum for Asset Recovery will bring together governments and law enforcement agencies to discuss returning assets to Nigeria, Ukraine, Sri Lanka and Tunisia.

The meeting will be held in the US next year, co-hosted with the UK, and supported by the UN and the World Bank.

http://www.bbc.com/news/business-36274302

The article also described actions promised this year by many countries, including for the UK:

It said the register would mean "corrupt individuals and countries will no longer be able to move, launder and hide illicit funds through London's property market, and will not benefit from our public funds".
It said foreign companies owned about 100,000 properties in England and Wales and that more than 44,000 of these were in London.