With Nato adrift and Brussels snubbed, is the UK key to Europe’s response to Trump?| Simon Tisdall

In a fast-moving crisis, the EU hasn't been nimble enough. The onus must fall on coalitions of the willing' to stop a US-Putin carve-up

At moments of great crisis, national leaders and governments generally put their countries' (and their own) interests first. Transnational geopolitical, economic and security alliances are all very well. But if such organisations do not or cannot rise to the urgent challenges of the day, they risk being bypassed, ignored or shunted aside. This is the predicament now facing the European Union.

After Donald Trump's appalling treatment of Volodymyr Zelenskyy in full view of the watching world on Friday night, all agree that the US president's betrayal of Ukraine, sickening embrace of Russia and his blunt demand that Europe henceforth defend itself represent just such an extraordinary challenge, and one that must be swiftly addressed.