US Retreat: The global power vacuum geopolitical risks you need to know

The US Didn't Fall From Leadership. It Walked Away.

For most of the post-war era, the United States was the architect of global order — free trade, collective security, open borders. These weren't just policies; they were the operating system of international relations. According to Ian Bremmer, speaking in World Collapse Expert: We're Entering The Most Dangerous Global Power Vacuum Ever on The Diary of a CEO, the US isn't losing that role through decline. It's rejecting it. The current administration is actively dismantling commitments that took decades to build, and even small shifts in US policy send shockwaves through global economics and security arrangements that were calibrated around American predictability. The problem isn't that America is getting weaker — it's that it's becoming unreliable by choice, which is a different and arguably more destabilising thing entirely.

The G0 World Nobody Voted For

When the US steps back, the assumption has always been that someone steps forward. That's not happening. Bremmer describes the emerging order as 'G0' — a world where no single nation or coalition can set and enforce global rules. China is rising but isn't ready, and isn't trusted, to lead. Europe is fragmented. The Global South is asserting itself but lacks the institutional weight to govern. What fills the vacuum isn't a new leader — it's a free-for-all where powerful nations write rules for their own benefit and smaller states absorb the consequences. The absence of a referee doesn't make the game stop. It just makes it dirtier.

China's Patience Is a Strategy

While Western economies chase quarterly results, China has been playing a decades-long game in critical minerals and electric vehicle technology. Lithium, rare earths, battery supply chains — China didn't stumble into dominance here. It spent years securing access, building processing capacity, and locking in relationships with resource-rich nations that others ignored. Bremmer's point is that this isn't just economic foresight — it's geopolitical leverage. As countries grow frustrated with US unpredictability and start shopping for more stable partners, China is already positioned to offer exactly that. It doesn't need to be the strongest economy today to win the next decade.

Iran Is Watching the Clock

Iran's leadership isn't rushing toward confrontation with the US. According to Bremmer, they're watching Trump's approval ratings and waiting. They saw how China absorbed Trump's tariff pressure and forced concessions — what Bremmer calls exposing his 'glass jaw' on economic leverage. Iran believes it can outlast the presidency, or at minimum extract better terms by not capitulating immediately. The most likely resolution Bremmer sees isn't a military victory for either side — it's an extended ceasefire where Iran concedes on nuclear enrichment in exchange for maintaining influence over the Strait of Hormuz and the ability to charge tolls on oil traffic passing through it. That's a long way from regime change. The implications for global energy markets are significant — as explored in our piece on Iran's Strait of Hormuz oil control and its global economic impact.

The Blockade That Isn't Quite War

A US blockade of Iranian oil exports sits in a strange legal and strategic grey zone. Technically an act of war. Practically, Bremmer frames it as a de-escalation compared to earlier threats of direct military engagement — a way to cut off Iran's funding without pulling a trigger. Trump had previously suspended sanctions on Iran to manage oil prices, which tells you everything about how inconsistent the strategy has been. The risk is that economic pressure of this kind doesn't stay contained. If Iran responds by threatening or disrupting Strait of Hormuz traffic, the consequences ripple far beyond the two countries involved — something we've covered in detail in our analysis of what a Strait of Hormuz disruption would actually cost the global economy. The scenario where US consumers feel this at the pump is not hypothetical — it's a policy decision away, as outlined in our breakdown of the gas price risk from an Iran oil blockade.

Israel, Hezbollah, and Borders Nobody Is Guaranteeing

In southern Lebanon, Israel is establishing a buffer zone following what Bremmer refers to as the 12-day war — a conflict that exposed both Hezbollah's vulnerabilities and Iran's insufficient deterrent capability. Hezbollah remains a serious force, but Israeli strikes on its leadership and infrastructure have demonstrated that it isn't untouchable. Iran, watching this, understands that allowing the US to dictate terms after military action sets a precedent it cannot afford. So it's maintaining posture while avoiding escalation it can't win. The Middle East is reorganising around this reality, with new alignments forming — one grouping UAE, Israel, the US, and India; another pulling together Saudi Arabia, Pakistan, Turkey, and Egypt. These aren't formal alliances yet, but they're the shape of what comes next in a region where the old rules no longer apply.

Europe's Strategic Hangover

Europe made a bet after the Cold War that peace was permanent and that someone else — mostly the US — would handle security and technology investment. That bet is now visibly failing. Bremmer points to Mario Draghi's competitiveness report as a diagnosis Europe largely agrees with but structurally cannot act on: 27 EU member states plus the UK, each with their own political cycles, cannot coordinate the kind of long-term strategic investment that China executes through central planning or the US executes through sheer market scale. Meanwhile, Europe's population is shrinking, productivity growth is slow, and its defence spending is only now catching up to where it should have been twenty years ago. Japan and South Korea face similar trajectories. These were the allies that made US global leadership viable. Their decline doesn't just weaken them — it changes the maths of what American leadership is even worth projecting.