How committed is Nato to the defence of the Baltic states? That was the question that Vladimir Putin was indirectly posing, when Russian fighter planes violated Estonian airspace last week.
北约(NATO)协防波罗的海国家的承诺究竟有多坚定？这是弗拉基米尔•普京(Vladimir Putin)在上周俄军战机侵犯爱沙尼亚领空时间接提出的问题。
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