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Russian authorities have been using foreigners who have obtained Russian citizenship to help fight the war in Ukraine, Aleksandr Bastrykin, head of the Russian Investigative Committee, said Thursday.…

In July, the search to find the world’s next top-tier copper reserve led a Silicon Valley start-up to the doorstep of a faded mining powerhouse.Late one morning, hard-hatted dignitaries watched keenly as a drill rig bit deep into rock in…