The leaders of Germany, France and Poland insisted they were united in their support for Ukraine at a summit in Berlin on Friday, but did not address a much-debated question about whether European troops would be sent to fight in the war zone. “All three of us are serious about our support for Ukraine,” German Chancellor Olaf Scholz said on Friday following consultations with French President Emmanuel Macron and Polish Prime Minister Donald Tusk. “More than ever, our unity is our strength. And our three states, Germany, Poland and France, have a special responsibility in this regard,” said Sch…