Ukraine and its Western allies should not try “to fight to victory with a nuclear power,” Russian Foreign Minister Sergey Lavrov warned in a speech at the United Nations General Assembly on Sept. 28. Since the launch of the full-scale invasion, Russia has repeatedly invoked the threat of its nuclear arsenal to deter Western military support for Ukraine. In his General Assembly address, Lavrov called Western attempts to defeat Russia “a suicidal escapade.” “I’m not going to talk here about the senselessness and the danger of the very idea of trying to fight to victory with a nuclear power, whic…