On his first full working day as the Netherlands' youngest prime minister, Rob Jetten did not reach for the phone to call Brussels, Berlin or Paris. He called Kyiv. The conversation with Volodymyr Zelensky, brief but pointed, carried a message that needed no elaboration: whatever had recently happened in The Hague - the collapse of a populist experiment, 11 months of dysfunction, three governments in four years - Dutch support for Ukraine was not among the casualties.