Is Argentina being sabotaged from abroad?
Not any more or less than other developing countries.
I'm on the far left politically, and I've always found it fascinating that Peronists of all stripes love to claim that Argentina is uniquely sabotaged or undermined by foreign state and non-state actors; it reminds me of people who claim to be victims of "gang stalking", always believing they're being targeted by a vague group of people for unknown yet sinister reasons. From the Peronist prospective, if the US in particular was so set on destroying Argentina then why didn't they help Macri more? Why didn't they intervene to help him remain president?
While developing countries are undoubtedly undermined by more powerful and wealthier states, the way some people act and behave here you'd think we live in Iran, Venezuela, Sudan, or North Korea. Let's be honest though Argentina, while you're a beautiful country, the US, EU, Russia, and China just aren't that in to you.
Populist and authoritarian states historically have blamed minorities or foreigners for their problems as others have noted: it's easy as it requires no self introspection, like a man who blames the reason for him being single on liberal societies and cultural norms.
If we want to ask the real question as to who is sabotaging Argentina, the answer is uncomfortable, yet easy: it's everyone who has been issued a DNI. Argentina's biggest problem is Argentines, but that's a more difficult and confrontational conversation than simply blaming Yanquis and Peronists for a country that lurches crisis to crisis, year after year, whether the president be a Dictator, Radical, Peronist, or Macri.