Alleged would-be Trump assassin Ryan Wesley Routh rolled up in Ukraine last year looking to fight the Russians and make an impact — but was quickly rejected and pushed aside after being dubbed a “wack job” and “off” by the more serious foreign fighters in the country, several sources involved in the volunteer effort said. While some had interacted with him personally, others told The Post they knew his “type” and were “not at all surprised by it.” “A crazy idiot, but no one’s really surprised. There are people like that that show up and are desperate to help and...