US President Joe Biden spoke at length Sunday with Ukrainian counterpart Volodymyr Zelensky about Russia’s military buildup along Ukraine’s borders, with the pair committing to pursue “diplomacy and deterrence,” the White House said. “The two leaders agreed on the importance of continuing to pursue diplomacy and deterrence in response to Russia’s military build-up on Ukraine’s borders,” according to a readout of the roughly 50-minute call. “President Biden reaffirmed the commitment of the United States to Ukraine’s sovereignty and territorial integrity,” the White House added, referring to the…