WASHINGTON — Vladimir Putin is feeling the sting of President Trump’s new oil sanctions — so much so that he dispatched one of his top henchmen on a desperate charm offensive across the US. Kirill Dmitriev, the Kremlin-linked financier who once served as Moscow’s backchannel to Washington, spent the weekend trying to schmooze top Trump officials and going on a media blitz. But the move failed spectacularly, with Treasury Secretary Scott Bessent bluntly blasting Dmitriev as a “Russian propagandist,” and NATO Amb. Matt Whitaker flatly rejected his overtures — saying the administration’s energy crackdown would continue. On one of the...