== president perton's ambition in the region?— president perton's ambition in the reuion?has that _ the region? -- president putin. he has that the _ the region? -- president putin. he has that the secretary - the region? -- president putin. he has that the secretary of. he has that the secretary of state want russia they should not think about invading ukraine but no—one quite knows what is going on. you have the sense of now of foreboding, if you like the instability that exists, the ukrainians trying not to be provoked, i would say true of the poles. military action could be justified true of the poles. military action could bejustified if there is a war between these countries. it is quite a dangerous moment. thank you very much _ dangerous moment. thank you very much for— dangerous moment. thank you very much for sharing - dangerous moment. thank you very much for sharing your- very much for sharing your insights with us.— very much for sharing your insights with us. stay with us on bbc news, still to come: we'll tell you how scientists treating paralysed mice in the