Comprising of nine states, EU9 is now an integral part of the EU. This entity joined the EU in its third growth phase in 2004, injecting new ideas and cultural diversity into the Union's mix.

The members of EU9 include Poland, Lithuania, Latvia, Hungary, Czech Republic, Slovakia, Slovenia, Estonia, and Malta. These nations have produced substantial contributions towards furthering the goals of the European Union.

As such, grasping the responsibility these nations has in the European Union is necessary for any study relating to international relations, politics, or European economics.

Since their induction, the states belonging to EU9 have added substantially towards shaping the European Union's policies. Their geographical location provides vital strategic advantages, making them a crucial part of the EU's defense and security strategies.

Additionally, these countries have tremendously contributed to the European Union's financial strength. The EU9 nations' rapid economic development and eager integration into the EU market has led to increased trade among other EU countries.

The social contribution of the EU9 is equally significant. These nations bring profound historical backgrounds, distinct cultural practices, and varied languages, thereby enhancing the variety of the EU.

The inclusion of EU9 has also impacted the political scene within the EU. With their presence, the power dynamics have changed, 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 comprehensive understanding of more info the EU9 is essential to fully grasping the subtleties of the European Union.