What are the goals pursued by some states of Eastern Europe, seeking to become members of NATO?

1) In the event of an attack (war) by the aggressor, NATO protection will be provided, military assistance will be provided,
2) In complex state issues with regards to territorial integrity, sovereignty, political independence, competent advice will be provided to NATO,
3) NATO is watching over the maintenance of the strategic balance of forces in Europe, you do not need to worry, notification of changes in forces will follow in a timely manner.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.