Where control of the external border is rendered ineffective to such an extent that it risks jeopardising the functioning of the Schengen area, either because a Member State does not take the necessary measures in line with a vulnerability assessment or because a Member State facing specific and disproportionate challenges at the external borders has not requested sufficient support from the Agency or is not implementing such support, a unified, rapid and effective response should be delivered at Union level.
I gás ina bhfágtar go bhfuil rialú na dteorainneacha seachtracha chomh neamhéifeachtach sin go bhféadfaí feidhmiú limistéar Schengen a chur i mbaol, bíodh sin toisc nach ndéanann Ballstát na bearta is gá i gcomhréir le measúnú leochaileachta nó toisc, nár iarr Ballstát a bhfuil dúshláin shonracha agus dhíréireacha roimhe ag na teorainneacha seachtracha, tacaíocht leordhóthanach ar an nGníomhaireacht nó nach gcuireann sé tacaíocht den sórt sin sin chun feidhme, ba cheart mearfhreagairt aontaithe agus éifeachtach a thabhairt ar leibhéal an Aontais.