Sparring between Washington and Moscow, a diplomatic, political and military constant since the end of WWII and start of the Cold War, is rightly back after the Trump years of weird and dangerous American subservience to Russian predations. Thank you, Joe Biden, for calling a killer a killer and, yes, thank you Vladimir Putin, for resuming your role as the heavy in the relationship. Rivals and opponents, respectful and wary of each other, not teacher and student, as Donald Trump seemed to happily be Putin’s fawning lapdog. Putin used his security services to interfere in the 2016 presidential …