Catalan officials have said they will not follow orders from the Spanish government as Madrid moves to reassert control over the region.
The Foreign Affairs Spokesman Raul Romeva said the central question was not about independence but about democracy.
A referendum outlawed by Spain was held on 1st October in Catalonia.
The Catalan government, led by President Carles Puigdemont, said that of the 43% said to have taken part, 90% were in favour of independence.
Unionist parties who won about 40% of the vote at the 2015 Catalan elections boycotted the ballot and many anti-independence supporters stayed away, arguing it was not valid.
Spain’s Prime Minister Mariano Rajoy announced on Saturday plans to sack Catalonia’s regional government.
Rajoy said he was triggering Article 155 of the constitution – an unprecedented move – which allows for direct rule to be imposed in a crisis on any of the country’s autonomous regions.
But Catalan leaders say they will not accept the plan.
Speaking to BBC, Romeva said: “How can the European Union live with that situation [if this happens]? How can the EU democracy survive and how can they be credible if they allow this to happen?
“Because what I can tell you is that the people and the institutions in Catalonia will not let this happen.”