Earlier quoted context omitted.
The international/European response is not set in stone and could wildly vary based on the Spanish response. If they send in troops, and should those troops fire on civilians, the Spanish may well lose international support. They were heavily condemned just for their police actions around the referendum. There also aren't that many countries that have serious internal strife in the western world anyway, that point is…
The international/European response is not set in stone and could wildly vary based on the Spanish response. That's absolutely wrong. And thinking that Spain will need to fire on civilians is ridiculous. Either wishful thinking or you are ridiculously misinformed.
All it takes is for armed police/military to meet large angry crowds that won't back down. If Spain sends the military to arrest the Catalonian government, we may end up with both of the ingredients. Perhaps a new Syria is unlikely, but is something on the scale of Euromaidan really that hard to imagine?