We have asked the question before: does Vladimir Putin's full-scale invasion of Ukraine put superpowers on a collision course? With the revelation that Iran is supplying Russia with not just drones but ballistic missiles, allies strongly suggest that a UK-US summit in Washington this Friday could, on the quiet, mean the end to the Biden administration's restrictions on Ukraine using the long-range missiles it provides for strikes deep inside Russia. 

Already Kyiv is growing bolder in response to the Kremlin's relentless targeting of its critical infrastructure, with Ukrainian drones this week hitting a military airport near Moscow and aiming for bases in Murmansk, all the way on the Arctic Sea. What would be legitimate targets for US-made ATACMs and Franco-British-made Storm Shadows? In view of Tehran's role, could war in the Middle East and tensions in eastern Europe conflate into one?

On that score, we hear what the candidates for US president had to say in their Tuesday showdown. How is that electoral campaign weighing on the military campaign between Russia and Ukraine?

Produced by Andrew Hilliar, Rebecca Gnignati and Ilayda Habip.