Do russia, italy, and germany have a constitutional government?
Yes, for the time being. Italy and Germany are both signers of the 2003 EU Constitution, which has yet to be fully ratified. When it is, those governments have implicitly signed and agreed that their Constitutions are superceded by the EU Constitution. The individual nations will still have the appearance of maintaining their own government structures via elections etc., however, the appointed (non-elected) EU Parliament will have the final say in all matters. In the interim, there are seversal components of sovereignty that these nations have alread surrendered to the non-elected EU government, such as commerce. The EU has the authority to overrule domestic legislation in these matters, therefore these governments maintain a limited Constitution. Once the EU is fully ratified, their individual Constitutions will maintain the appearance of inividual governments, but will be superceded by the EU in all matters. With regards to Russia, they are not members of the EU and they still mainta