By Jeff Mason and Josh Smith WASHINGTON/SEOUL (Reuters) -Russia recently used short-range ballistic missiles (SRBMs) sourced from North Korea to conduct multiple strikes against Ukraine, the White House said on Thursday, citing newly declassified intelligence. National security spokesperson John Kirby told reporters the United States will raise the development with the United Nations Security Council. Kirby called North Korea’s arms transfer to Russia a “significant and concerning escalation” and said the United States would impose additional sanctions against those facilitating the arms deals…