The U.S. has held back from imposing secondary sanctions on China over its support for Russia's war on Ukraine because broader trade negotiations are continuing, the U.S.' envoy to NATO said Tuesday.

President Donald Trump has threatened to slap sanctions on buyers of Russian oil unless an agreement between Kyiv and Moscow can be reached to end the conflict that's now well into its fourth year. So far the White House has only imposed the tariffs on India over its purchases of Russian crude, but not China.

"President Trump has not put tariffs on China because those negotiations are ongoing. And the war in Ukraine is certainly part of that discussion," U.S. Ambassador to NATO Matthew Whitaker told Bloomberg in an interview in Bled, Slovenia.

"I don't disagree those would be effective," Wh

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