美国在安全警告中取消对尼日利亚人的签证,引发外交紧张。 U.S. cancels visas for Nigerians amid security warnings, sparking diplomatic tensions.

美国警告其在尼日利亚的公民安全风险, 并悄悄取消包括记者和官员在内的许多尼日利亚人的签证, The U.S. has warned its citizens in Nigeria about security risks and has quietly canceled visas for many Nigerians, including journalists and officials, without giving prior notice. 特朗普政府以违反国家安全和签证为理由,而尼日利亚政府则对缺乏正式解释表示关切。 The Trump administration cites national security and visa violations as reasons, while Nigeria's government has expressed concerns over the lack of formal explanation. 此举与尼日利亚人的签证费增加相吻合,并建议收紧美国的签证政策。 This move coincides with increased visa fees for Nigerians and suggests a tightening of U.S. visa policies.