这是个不完整的句子,其实只是一个短语,后面还应该有其它句子.
In foreign policy 是介词短语,是这个整个短语的核心,它带有下面一个定语从句.
that means dropping the confrontational approach to Russia 是定语从句,修饰policy.
favoured by Mr Tusk and Radek Sikorski,是过去分词短语,与前面的定语从句并列修饰policy.
his foreign minister是Radek Sikorski的同位语.