How long can Russia keep fighting the war in Ukraine?

It’s exactly one year since Russia’s full-scale invasion of their neighbour to the West. And with Putin showing no signs of backing away from his initial plan, the only way one can imagine this war to end is when Russia can no longer sustain it. The Financial Times assesses the four key areas Putin must draw on: «the forces on the battlefield; Russia’s stock of munitions; the Kremlin’s economic war chest; and ordinary Russians’ feelings about the war.»