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Russian President Vladimir Putin has warned that any country trying to intervene in the war in Ukraine could face a “lightning fast” retaliation.
Ukraine’s allies have stepped up arms supplies, and the United States has promised to ensure that Ukraine defeats Russia.
Western officials say Russia is an obstacle to its efforts in the east.
Last week, after leaving the area around the capital, Kiev, Russia launched a major offensive to capture the Donbass region.
But according to an official, Russian forces are finding it difficult to cope with the fierce Ukrainian opposition and are facing casualties.