Russia's political and business leaders were quick to chalk up last week's summit with U.S. President Donald Trump as a victory for Vladimir Putin. Now some fear Putin may have overplayed a winning hand and are bracing for a U.S. sanctions backlash. [...]

While the sanctions proposed by Republican Lindsey Graham and Democrat Bob Menendez were seen by most political risk analysts as unlikely in the near term, new curbs contemplated by other U.S. lawmakers targeting the energy and metals sectors are more realistic, they say.