Prague, Feb 17: The migrant crisis can only be resolved by the united European Union, European Council President Dold Tusk said, after a meeting with Czech Prime Minister Bohuslav Sobotka. Tusk is in Czech Republic to participate in a Prague summit of the Visegrad Four (V4) group (Czech Republic, Hungary, Poland, Slovakia) on Tuesday. Apart from the V4 prime ministers, the meeting was attended by Macedonian President Gjorge Ivanov and Bulgarian Prime Minister Boyko Borisov. The participants of the summit agreed that migrant crisis has no other solution but a joint European Union effort. The leaders of the six countries agreed on the need to implement agreements between the EU and Turkey and support the efforts of Greece to fulfill the conditions of its Schengen membership. (IANS)