Ukraine has not reached a stalemate in its war with Russia because the west can help Kyiv by “dropping five more queens on the board”, according to an influential historian of eastern Europe. Timothy Snyder, a Yale professor, argued that continuing high levels of military aid could allow Ukraine to prevail, in response to a recent interview given by Kyiv’s top military commander, Gen Valerii Zaluzhnyi, suggesting that the war was deadlocked. “I hate the stalemate analogy because war is not a game of chess,” Snyder said in an interview with the Guardian. “In chess, there are only so many…