Susan Rice, former President Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE's national security adviser, ripped President Trump’s foreign policy moves on Friday, asserting they represented "a whole lot of winning" for Russia and China.

“With shocking speed, he has wreaked havoc: hobbling our core alliances, jettisoning American values and abdicating United States leadership of the world,” Rice wrote of Trump in a New York Times op-ed.

“That’s a whole lot of winning — for Russia and China,” she added.

Rice, who previously served as the U.S. ambassador to the United Nations, noted Trump's foreign policy moves in his first four months in office, including withdrawing the U.S. from the Trans Pacific Partnership (TPP) to this week announcing his decision to withdraw from the 2015 Paris climate change agreement.

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The U.S. decision to withdraw from TPP was widely viewed as opening the door for China to assert its own views on trade in the region. Rice also knocked Trump for refusing during a trip to Europe last week to express support for the mutual defense of NATO allies under the alliance's Article 5, arguing "nothing could have thrilled President Vladimir V. Putin of Russia more."

Pointing to such decisions, Rice argued that the U.S. has “voluntarily” given up its global leadership post because it has isolated itself from the international arena.

“It was not taken from us by any adversary, nor lost as a result of economic crisis or collapse of empire. America voluntarily gave up that leadership — because we quit the field," she wrote.

Rice warned that allies may be less likely to come to the United States's aid in the face of a crises due to what she claims is an isolationist foreign policy under Trump.

“If China takes aggressive action in the South China Sea, threatening our Asian allies as well as our own freedom of navigation, will our Western allies risk the economic repercussions of confronting China to stand beside an “America First” president who refuses to affirm our NATO commitments?” she wrote.

Obama himself sharply criticized Trump's decision this week to withdraw from the Paris accords, which his administration helped negotiate. Former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE also slammed the decision, calling it "self-destructive" to America's interests.