Analysis: Moscow and Ankara are vying for influence in Libya, but their competing economic interests could collide.
The oil price war pushed relations between Russia and Saudi Arabia to breaking point.
Some experts believe Russia decided to ratchet up its oil output to finish off the US shale industry. But is there more to it?
Riyadh put its best face forward at the 2020 World Economic Forum as it basked in the glow of 2019's public offering of shares in Saudi Aramco.
Prices are likely to stabilise as Iran decides how to retaliate, and when.
The record valuation, which defied sceptics' predictions that the stock price would wallow, cheered Crown Prince Mohammed bin Salman, who had championed the public offering.
Saudi Aramco has finally set an initial public offering date in December while the country's Capital Market Authority has placed a number of conditions to reduce risk.
As Putin makes his second visit to Riyadh in 12 years, Saudi-Russia relations remain steady, despite the countries being on different sides of several thorny geopolitical issues.
The attacks on Saudi Arabia, the world's largest oil producer, show there are circumstances under which an energy-dominant country can lose its supposed dominance fast.