Trump and Putin's meeting in Alaska had the world on edge.  And now, the prospect of a second summit in Moscow has sent shockwaves across the globe. But just 48 hours after the Alaska summit, Donald Trump is set to meet Ukrainian President Volodymyr Zelenskyy. The big question-is there a real shot at peace?  There are two key aspects to these developments:  First, the possibility of ending the longest war since World War II-and second, understanding the contours of a potential peace formula.  Has the summit been merely about optics, or has it genuinely set the stage for a historic peace deal?