UPDATE 1-Russian oil output highest in 30 years ahead of Doha meeting

* Russian March oil output up to 10.91 mln bpd * Leading producers to meet in Doha to discuss output freeze * Small firms behind output rise, majors' output falls (Writes through) By Vladimir Soldatkin MOSCOW, April 2 (Reuters) - Russia's oil production rose 0.3 percent to 10.91 million barrels per day in March, its highest level in nearly 30 years, raising questions over Moscow's commitment to freeze output ahead of a producers' meeting in Doha later in April. Energy Minis











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