July 11: At an RNC Platform Committee meeting, a Cruz delegate proposes an amendment that called on the US government to send lethal weapons to Ukraine in response to Russian "military aggression" in the region. Trump campaign aides initiated a process to stop that language from officially being adopted, according to CNN reporting. The final version of the platform strips out the reference to arming Ukraine and calls on the US to provide "appropriate assistance" instead. The platform does support US sanctions on Russia and includes a threat of more sanctions if Russia continues meddling in Ukraine. At the time, Manafort denies that the campaign had any involvement in the change. But in March 2017, Trump campaign adviser JD Gordon tells CNN that he is one of the campaign aides who stepped in to defeat the amendment that included references to "lethal defensive weapons" for Ukraine.
Source : http://www.cnn.com/2017/02/16/politics/trump-russia-timeline/index.html156