System Update with Glenn Greenwald Prof. John Mearsheimer on Why Foreign Involvement in Iran Would Fail, U.S. Aggression Toward Venezuela, Trump's Foreign Policy, and More
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Jan 14, 2026 
John Mearsheimer, an international relations scholar known for his realist perspectives, dives into critical issues like U.S. involvement in Venezuela and Iran. He critiques Trump's actions as imperialistic, discussing how limited military strategies often backfire. Mearsheimer warns that any U.S. intervention in Iran could unite the populace against their government. He explores the dangers of sanctions and de-dollarization, highlights the power of nationalism, and predicts a grim future for diplomatic resolutions in Ukraine.
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Venezuela Action Was Imperial Overreach
- John Mearsheimer says the Venezuela operation had no security justification and resembled old-fashioned imperialism.
- He argues Trump's stated motive—seizing Venezuelan oil—is foolish and unlikely to justify aggression.
Monroe Doctrine Misused As Imperial Cover
- Mearsheimer explains the Monroe Doctrine forbids foreign military presence or alliances in the Western Hemisphere, not economic ties or U.S. domination.
- He says using the Doctrine to justify regime control is plain imperialism, not doctrine.
Pinprick Warfare Avoids Quagmires
- Mearsheimer credits Trump with limited 'pinprick' military operations that avoid long quagmires and heavy occupation.
- He views this as a strategic choice to gain leverage without committing to nation-building.