Western sanctions over the Ukraine crisis could force some executives at Russian firms with foreign passports to give up certain duties, complicating life at the top of some of the country’s largest companies.

President Vladimir Putin has lamented the latest round of US sanctions against Russia, saying they are stalemating bilateral relations and hurting not only Russian but also American businesses.

The richest man in Russia after Roman Abramovich today unveiled plans to float his steel giant on the London market with a mooted value of £6bn (€8.8bn).