Factbox: EU vote - the domestic fall-out in Greece and across Europe
European Parliament elections not only determine the make-up of the next EU assembly and help decide who ends up running top European institutions but can also play back into the national politics of the bloc's 28 member states.
Here is a run-down of some of those national stakes after polls closed on Sunday and exit polls and early results came in:
FRANCE: Emmanuel Macron's allies put on a brave face as exit polls showed a narrow defeat at the hands of Marine Le Pen's far-right Rassemblement National party. But such a result would be a clear setback for the French leader, who had personally invested time in campaigning for the European vote. His Elysee Palace said it would "intensify" his reform effort.
GERMANY: Angela Merkel's ruling conservatives and their Social Democrat (SPD) coalition allies both suffered losses, bleeding support to the Greens in a further...