British Prime Minister Sir Keir Starmer is facing growing questions about his pledge to deploy boots on the ground and planes in the air over Ukraine when the UK Armed Forces has seen the number of soldiers dwindle to the lowest since the Napoleonic era and other services hollowed out. After months of declining support amid domestic failures, Prime Minister Starmer has recently attempted to recast himself as an international leader through the war in Ukraine. The leftist PM has joined with French President Emmanuel Macron — who has also suffered domestically over the past year — in offering up...