The EU Commission should help states on the continent bring their positions closer with regard to the migration crisis, the government quotes the Prime Ministers of Bulgaria, Serbia and Hungary as saying.

Boyko Borisov received Aleksandar Vucic and Viktor Orb?n in the Black Sea city of Burgas on Tuesday and discussed measures that could be commonly adopted with regard to the crisis.

Their visit comes ahead of a summit in Bratislava, Slovakia, where migration is again expected to top the agenda. Vith Vucic leaving on Wednesday, Orb?n is set to stay and inspect security at the Bulgaria-Turkey border, on his second visit in less than six months. 

Only through joint effort to find a solution could the right approach be found, Borisov said against the backdrop of the Visegrad Group's calls for a tougher approach which restricts the inflow of migrants to Europe.

While Bulgaria would accept all EU assistance for border protection, it would also count on the EU-Turkey migrant deal to curb the inflow, he added.

"We put up protective equipment [a border fence] in order to have any chance at all to protect the European border, for which we are responsible," Borisov argued.

But he also opined cooperation between Sofia and Ankara had been going smoothly.