Britain's seven-time Formula 1 world champion Lewis Hamilton has repeated his call for Saudi Arabia to improve its human rights record on the eve of the country's second ever grand prix.

The Gulf kingdom is one of the states accused of investing in sport and using high-profile events to 'sports wash' its reputation in other parts of the world.

Premier League club Newcastle were bought last year by a group led by Saudi Arabia's sovereign wealth fund - prompting similar concerns.

The Saudi Public Investment Fund (PIF), which provided 80% of funds for the deal, gave the Premier League "legally binding assurances" that it was run separately from the state.

Many Newcastle fans welcomed the takeover, but critics condemned the deal as "an extremely bitter blow for human rights defenders".

Hamilton says he is not comfortable racing in the country and that it is not the driver's "responsibility" where to race - but that they are "duty bound" to raise awareness.

Here are some of the reasons why Saudi Arabi's involvement in sport has proved controversial.