Mỹ thừa nhận khó khăn ngoại giao trong thế giới đa cực
Ngoại trưởng Mỹ John Kerry ngày 22/4 đã thừa nhận ngành ngoại giao Mỹ đang đứng trước những khó khăn hơn nhiều so với thời kỳ Chiến tranh Lạnh trước đây.
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