Nearly five years into its fight for national survival, Ukraine has entered a moment of intense vulnerability, under growing pressure not only from Russia but also now from the United States. 在为国家生存而战近五年之后，乌克兰陷入了一个异常脆弱的时刻，不仅来自俄罗斯的压力越来越大，如今美国也在施压。 A double…