European Commission chief Jean-Claude Juncker warned Greece's new government that Brussels will not change all of its rules just to solve the debt crisis in Athens.
France's economy minister said he had received death threats from "certain officials" furious over his plans to reform parts of the closed-shop economy.
Greek Finance Minister Yanis Varoufakis said he wanted to reach a new agreement with international creditors on his country's debt burden "by the end of May".
A congress of Germany's anti-euro AfD party ending moved to streamline its leadership structure in a bid to be more effective after weeks of dispute within the fledgling group.