BERLIN (Reuters) - A dispute between the Spanish government and the leaders of Catalonia over the region s efforts to seek independence could only be solved through talks based on the Spanish constitution, German Foreign Minister Sigmar Gabriel said on Wednesday.  A unilateral declaration of Catalonian independence would be irresponsible,  Gabriel said in a statement.  A solution can only be found through talks on the basis of the rule of law and within the framework of the Spanish constitution.  
Solution to Catalonia crisis only under Spanish law: Germany