It’s not even a month since Trump took office, and already his actions are starting to reshape — or at least unsettle — the global order. First came the news that Donald Trump and Vladimir Putin had spoken on the phone, signalling a massive departure from the US government’s policy of Russian isolation. Then, US Vice President JD Vance went as far as saying that the US believes Europe needs to take more responsibility for its own defence. The fear among European leaders is that if the US drastically reduces its support for Nato in Europe, it could leave the door open for Russian aggression. Donnacha Ó Beacháin, politics professor at Dublin City University and author of Unfinished Empire, joins us to examine why this seismic shift is underway.

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