U.S. President Donald Trump has pledged to treat any armed attack on Qatar as a threat to the United States' own security, according to a document published on Wednesday that says U.S. forces could step in to defend the Middle Eastern nation.

Qatar on Wednesday welcomed Trump's order, describing it as a milestone in strengthening defence ties and bilateral cooperation, its foreign ministry said.

The executive order — which appears to significantly deepen the U.S. commitment to Qatar — comes after Israel last month attempted to kill Hamas leaders with an airstrike on Doha.

That strike, launched with little advance notice to the Trump administration, caused consternation in Washington given the close U.S. relationship with Qatar, which hosts the largest U.S. military base in the region

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