The Catalan government ignored Madrid’s demand for “clarification” on Thursday, which was accompanied with an ultimatum.

If Barcelona failed to make clear that Catalonia has not proclaimed independence, Madrid would suspend Catalan autonomy and proceed with direct rule, in line with article 155 of the Spanish Constitution.

Barcelona ignored the ultimatum and issued its own on Thursday. President Puigdemont threatens to proclaim independence if Spain does proceed with direct rule. In a letter t...