Title: Comprehending EU9: The Essential Role it Hold in the EU

EU9, has become an essential part of the European Union (EU). The EU9 became part of the EU in its third enlargement phase in 2004, injecting diversity and fresh perspectives into the grand unity.

The EU9 EU9 countries include Poland, Lithuania, Latvia, Hungary, Czech Republic, Slovakia, Slovenia, Estonia, and Malta. These nations have given significant inputs towards advancing the aims of the European Union.

In this respect, grasping the responsibility these nations plays in the EU is necessary for any study relating to international relations, politics, or European economics.

Right from their admission, the states belonging to EU9 have given significantly towards shaping the policies of the European Union. Their geographical location offers important strategic benefits, turning them a considerable part of the defense and security strategies of the EU.

Additionally, these states have immensely contributed to the European Union's financial strength. The EU9's rapid economic growth and eager integration into the European market has resulted in increased trade among other EU states.

The cultural contribution of the EU9 is equally significant. These countries incorporate rich historical backgrounds, unique cultural practices, and assorted languages, therefore enhancing the variety of the EU.

The inclusion of EU9 has also affected the internal politics within the EU. With their involvement, the power dynamics have shifted, with new coalitions and alliances emerging.

In conclusion, the roles played by the EU9 nations are substantial. From economic influence to cultural richness, and from security strategies to political dynamics, EU9 has strengthened the European Union's structure. As such, an in-depth understanding of the EU9 is crucial to fully grasping the complexities of the European Union.