French hard-right leader Marine Le Pen and Hungarian leader Viktor Orban have accused the European Union of flooding the continent with migrants who have 'destroy[ed] our cities... [and] kill[ed] peaceful citizens.'

Speaking at a rally in France on Monday, the pair launched scathing attacks on the EU and accused Brussels of denying 'states of their most sacred right, that of deciding who enters and who remains on their soil.'

Aimed at marking one year since Le Pen's National Rally (RN) crushed opponents to win their best-ever vote share in European elections, the get-together in Mormant-sur-Vernisson south of Paris brought together hard-right leaders from across Europe.

The mood was buoyant and confident in the wake of Donald Trump's return to the White House earlier this year and strong election results across the continent.

Orban, revelling in his self-proclaimed status as the 'black sheep of the EU' and 'Brussels' nightmare', likened European migration policy to 'an organised exchange of populations to replace the cultural base' of the continent.