請問以下兩處怎麼翻譯比較流暢123

Russian lorries taking aid to conflict-hit east Ukraine have started a second day of their journey. The convoy of almost 300 vehicles stopped overnight in the southern city of Voronezh, and is due to arrive at the Ukraine border later on Wednesday. Uncertainty remains about how the aid will be delivered, amid... 顯示更多 Russian lorries taking aid to conflict-hit east Ukraine have started a second day of their journey.
The convoy of almost 300 vehicles stopped overnight in the southern city of Voronezh, and is due to arrive at the Ukraine border later on Wednesday.
Uncertainty remains about how the aid will be delivered, amid fears Russia could use the convoy as a pretext for military action in Ukraine.


請問下這裡的 is due to 該如何解釋比較通?
還有 amid fears 該如何解釋比較通?
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