Asked during a confirmation hearing how he viewed the strains facing the post-war world order, Mattis replied: "I think it's under the biggest attack since World War II sir, and that's from Russia, from terrorist groups and with what China is doing in the South China Sea."
"Russia is raising grave concerns on several fronts and China is shredding trust along its periphery," Mattis told the Senate Armed Services Committee.
China's military build-up in the South China Sea has raised tensions with regional neighbors and with the United States, and US lawmakers are alarmed by Putin's military actions in Syria, Crimea and elsewhere.
His stance on Russia stands in contrast to that of Trump, who has repeatedly praised Putin's leadership qualities and advocated closer ties with Moscow.
"History is not a straightjacket... But we have a long list of times that we have tried to engage positively with Russia; we have a relatively short list of successes in that regard," Mattis said.
With regard to China, Mattis elaborated in written testimony that the United States must try to engage and collaborate with China where possible, "but also be prepared to confront inappropriate behavior if China chooses to act contrary to our interests."
He has been quoted as saying, "Be polite, be professional, but have a plan to kill everyone you meet."
The tough-talking warfighter is popular among politicians and troops alike, but his nomination raised some eyebrows because he only hung up his uniform in 2013.
Senators were expected to probe Mattis, a retired Marine Corps general on the importance of civilian control of the military.
A cornerstone of US democracy is that civilians, not troops, must have control of the military, and the commander-in-chief is the president. US law prohibits officers from serving as defense secretary for seven years after leaving active duty.
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