[Men throw stones and fight with sticks during a scuffle at a makeshift camp for migrants and refugees at the Greek-Macedonian border near the village of Idomeni]Migrant flows to Greece have decreased markedly in recent months, Greek Prime Minister Alexis Tsipras said on Wednesday, defending his government's support of a deal between the European Union and Turkey to tackle the migrant crisis. Turkey and the EU last month sealed an accord which aims to end the chaotic arrival of migrants and refugees, most fleeing war and poverty in the Middle East, Africa and Asia, after more than a million reached Europe last year. Hundreds have died making the short but precarious crossing from Turkey to the shores of Greek islands in inflatable dinghies.