US President Joe Biden has announced a ban on imports of Russian diamonds, seafood and vodka in the latest response to Russia's war in Ukraine. He also said Western allies plan to revoke Russia’s status as an equal trade partner, paving the way for further economic punishment. The moves add to sanctions that have isolated Russia economically since the invasion. Its currency has collapsed, while global firms rush to exit the country. Russian President Vladimir Putin has likened Western sanctions on banks and oligarchs to a declaration of war. Moscow has also threatened to nationalise production plants or factories where...