President-elect Donald Trump’s national security team has held discussions with the White House and Ukrainian leaders as part of a concerted effort to find a way to end the war with Russia, multiple sources with knowledge of the matter told NBC News. 

Trump’s advisers and Cabinet nominees, who hold a range of views on Ukraine, have yet to present a conceptual or specific peace plan to Kyiv, the sources said. 

The president-elect has vowed to end the conflict even before he is inaugurated…