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"There is a solid understanding among the global community that free trade is important," Kuroda told reporters upon arrival for the G20 finance leaders' meeting that kicked off on Monday.
"I don't think protectionism will spread globally," he added.
Worries about the potential for a US-China trade war and frustration over US President Donald Trump's import tariffs threatened to dominate the meeting, which is also set to debate cryptocurrencies and the global economic outlook.