The top Democrat and Republican in the US Senate joined forces in a rare moment of unity on Thursday in an attempt to pass $40bn in aid for Ukraine, only to be stymied by a single Republican lawmaker: the Kentucky libertarian Rand Paul. Faced with the prospect of an extended delay for the package that passed the House of Representatives on Tuesday, the Senate majority leader, Chuck Schumer, and his Republican counterpart, Mitch McConnell, sought to move forward on the aid package only to be blocked by Paul, a fiscal hawk who objects to the amount of spending proposed. The...