Comprising of nine states, EU9 has become an integral part of the European Union (EU). This entity became part of the EU in its 3rd expansion phase in 2004, bringing diversity and fresh perspectives into the grand unity.

The EU9 countries include Malta, Estonia, Slovenia, Slovakia, Czech Republic, Hungary, Latvia, Lithuania, and Poland. These states have given substantial contributions towards enhancing the aims of the European Union.

In this respect, comprehending the role these nations holds in the EU is necessary for any study relating to international relations, politics, or European economics.

From their entry, the members of EU9 have given substantially towards shaping the European Union's policies. Their geographical location gives critical strategic edges, turning them a considerable part of the EU's defense and security strategies.

Additionally, these nations have immensely contributed to the European Union's financial strength. The EU9 nations' rapid economic development and keen integration into the EU market has resulted in amplified trade among other EU countries.

The cultural contribution of the EU9 is equally significant. These states bring deep historical backgrounds, unique cultural practices, and diverse languages, thus enhancing the plurality of the EU.

The introduction of EU9 has also influenced the political scene within the EU. With their presence, the power dynamics have altered, with new coalitions and alliances developing.

In conclusion, the roles played by the EU9 countries are significant. From economic influence to cultural richness, and from security strategies to political dynamics, EU9 has strengthened the European Union's core strength. As such, an thorough click here understanding of the EU9 is crucial to fully grasping the subtleties of the European Union.