WASHINGTON — President Donald Trump is expected to leave for Asia at the end of the week, betting that an around-the-world journey will help him untangle big issues that he can’t afford to get wrong.

At stake is nothing less than the future of the global economy, which could hinge on whether he’s able to calm trade tensions during an expected meeting with Chinese leader Xi Jinping. A misstep could send shock waves through American industries that have already been rattled by Trump’s aggressive tariffs, government layoffs and political brinkmanship.

Trump’s strategy of improvisation has had both hits and misses since he returned to office in January. Hamas returned hostages to Israel but the ceasefire in the Middle East remains fragile; a trade war with China has ebbed and flowed this yea

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