The Greek government announced on Saturday that some 40,000 migrants had been blocked from entering the country along the northern border with Turkey since the beginning of the year. Greece is often a key stopping point for people fleeing Africa and the Middle East to try to reach a better life in the European Union. Many come via Turkey at the Evros border, and in 2020 Athens bolstered border controls after large numbers of migrants tried to cross the Evros River in the north. Athens has accused Ankara of not doing enough to stop smugglers from sending migrants across the border — often in f…