Helsinki - Russian President Vladimir Putin lashed out yesterday at plans to expand NATO eastwards and said only a "sick mind" could believe Moscow poses an aggressive threat to European security. "I underline that there are no objective conditions for NATO enlargement, for the Baltic states to become members," Mr Putin told a news conference with Finnish President Tarja Halonen. "We are not glad about this. We think it is a mistake," he said, adding that expanding the western alliance would not solve a single problem in Europe's current security environment, and denying that Russia had any aggressive intent.