But the deal announced on Tuesday still won't provide enough votes in parliament for the Socialists, who won Sunday's election, to take office without the support of other parties.
Spanish authorities have been battling separatist activists since 2017 with many independence leaders jailed over controversial charges related to their role in the secession bid.
Anti-Beijing protesters plan to hold demonstrations on Thursday evening in support of Catalan protests, which re-started over jail sentences handed out to nine separatist leaders.
The jet crashed after performing in Spain's national day parade. Spain celebrated the day during an ongoing crisis with Catalonia. In the meantime, several rallies were taking place on the streets of Madrid and Barcelona.
Catalan leader Puigdemont baulked at declaring full independence for the region and instead called for talks with Madrid. Here's what could happen next.
Madrid accuses Catalan leaders of using last week's attacks to win independence from Spain at the cost of the region’s security.
The former captain and coach of Barcelona, Pep Guardiola told supporters of the movement that "we have no other option but to vote."
Artur Mas defied an order from the Spanish Constitutional Court by organising a non-binding referendum in 2014 in which the vast majority of Catalan participants voted for independence.
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