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The しており in this particular sentence is certainly not 謙譲語 because the speaker is not talking about himslef. Rather, he is talking about ロシア軍. One uses 謙譲語 to indirectly show respect to the listener by speaking humbly about himself. In news reporting, as you stated, there is no need or expectation of the use of any kind of 敬語. In this case, しており is simply ...
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