The issue focused on whether the U.S. could keep its military forces in Europe to prevent Russian intervention and whether the U.S. would be unable to keep forces out of Ukraine.

"I would like to emphasize that the U.S. remains a strong military power in Europe," she said, adding that Washington would have to keep its troops in Europe to prevent a possible Russian intervention in Europe and to deter a potential threat from China to its strategic interests there.

She also said U.