The controversy overflowing the banks of the press conference between Donald Trump and Vladimir Putin is a moment to step back and assess the nonstop maelstrom called the Trump presidency.

Mr. Trump’s famous modus operandi is the art of the deal. Keep everyone guessing and off balance. Decision first, details later. Drive events, stay on offense, force everyone to react. In this, Mr. Trump has succeeded.

No one—from the individuals who work daily in the White House to friends and enemies in foreign capitals—knows what he may do next. A high-ranking official from an Asian ally who visited the Journal’s offices recently was asked if his government has a clear idea of what Mr. Trump wants them to do on trade. “No,” he said, “we do not.”

The whole world is back on its heels, which is where, according to theory, the art-of-the-deal master wants them.

There is another pop culture phrase nearly everyone knows: “Show me the money!” It means there comes a time when the man offering deals has to stop talking and start producing results.