Russia oligarchs: The mega-rich men facing global sanctions

The UK, EU, and US governments have responded to Russia's invasion of Ukraine with devastating sanctions against the billionaire businessmen perceived to be in President Vladimir Putin's inner circle.

Mr Putin has warned his allies for many years they should protect themselves against such measures, particularly as relations soured with the US and EU countries after the annexation of Crimea.

But while some of those closest to him took his advice and remained invested in Russia, others kept their money in palatial properties overseas and football clubs, and their companies remained listed on foreign stock exchanges.

They now find themselves scrambling to hold on to their assets amid the most comprehensive economic penalties imposed in the modern era. Here's what we know about some of them.