World leaders keep trying and failing to get Donald Trump

Updated 6:02 PM ET, Thu June 7, 2018

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(CNN)Imagine you're the leader of a major world power.

How do you deal with Donald Trump? None of them can figure it out.
Trump's never-ending handshake with Macron
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Trump asks for a military parade
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They've been extremely deferential.
    But none of it has worked.
    Instead, he hits them with tariffs, pulls out of some treaties and questions others. He wants to renegotiate just about everything. He upends decades of foreign policy -- diplomatic, nuclear, economic, you name it.
    He doesn't care if you're an ally now or if you've fought wars together in the past or if there's a DMZ between your troops and his.
    Trudeau: No sign of US common sense prevailing
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    Trudeau: No sign of US common sense prevailing 01:45
    He wants to put up walls. He might, intentionally or not, insult you and your people. He'll make up trade deficits that don't exist. He'll make jokes about history.
    Trump emulating Nixon's 'Madman Theory'?
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      But you can't rely on US ambassadors or Pentagon contacts. He regularly surprises them. He does it all the time.
      Trump said he's going to put "America First." He seems to mean it. But you never really know what he's going to do next.
        Is he doing it on purpose? Doesn't really matter. It's impossible to figure out.