For a fleeting moment, Ukraine’s conflict may have come full circle. In the past 48 hours, US President Donald Trump has perhaps said his most forcefully direct words yet on arming Ukraine. And in the same period,

Donald Trump privately urged Ukraine to strike targets deep inside Russia, including Moscow, if supplied with advanced US weapons, signalling a pivotal policy shift in the war and raising stakes for Nato and Kremlin escalation.

Pivots have been jarring, particularly for those whose criticism of military aid was central to their political brand

While the US president's shift in tone on both Ukraine and Russia is huge, we need to remember that he can let deadlines slip and flip-flop repeatedly, writes Sky's Mark Stone.