Former Prime Minister Tony Abbott has told a group of European conservatives the migrant crisis afflicting the continent has the "look of a peaceful invasion" as he urged European leaders to adopt Australia's strict turn-back policy.

In an address to the Alliance of European Conservatives and Reformists in Prague on Saturday night, Mr Abbott said it was "more important than ever to be brave" and a post-Brexit Britain and Europe needed to consider immigration changes.

Former prime minister Tony Abbott wants 'much less factionalism within the Liberal Party'. Credit:Alex Ellinghausen

Mr Abbott said a country that could not control who entered its territory "will eventually lose control of its future".

"That need not end free movement – but it would end uncontrolled movement – and why shouldn't each country keep the final say over who can enter," Mr Abbott said in the speech, which he posted to his website on Sunday.