"We will continue to prosecute the campaign against terrorists, but great power competition - not terrorism - is now the primary focus of USA national security", Defense Secretary Jim Mattis said in prepared remarks at the Johns Hopkins School of Advanced International Studies in Washington.
The announcement sparked a backlash from Russian Foreign Minister Sergei Lavrov, who branded the new USA strategy as "confrontational".
"China is a strategic competitor using predatory economics to intimidate its neighbors while militarizing features in the South China Sea", Mattis wrote.
Russia's Foreign Minister Sergey Lavrov told reporters at United Nations headquarters in NY that militaries frequently want more resources, but "it is regrettable that instead of having normal dialogue, instead of using the basis of global law, the U.S.is trying to prove their leadership through such confrontational strategies and concepts".
"Concurrently, Russia seeks veto authority over nations on its periphery in terms of their governmental, economic and diplomatic decisions, to shatter the North Atlantic Treaty Organisation and change European and Middle East security and economic structures to its favour", the document said.
But he added that it is unclear whether the tougher posture will translate into action on the ground, such as greater U.S. military presence in the Asia-Pacific, as resources remain an issue. The strategy, summarized in an 11-page unclassified version released Friday, is the first of its kind in a decade and outlines a vision for restoring the military's combat readiness, which Mattis said has been depleted by 16 years of continuous war and years of budget instability.
"It's not a war-fighting capability unless it's the worst day in our nation or world's history", Mattis said.
The defence strategy is the latest indication of hardening resolve by President Donald Trump's administration to address challenges from Russian Federation and China, at the same time he is pushing for improved ties with Moscow and Beijing to rein in a nuclear North Korea. I have sat behind Secretary Rumsfeld when he came here and said you are going to have to pay more; you can't expect the Americans to keep doing this.
"For too long we have asked our military to stoically carry a "success at any cost" attitude, as they work tirelessly to accomplish the mission with now inadequate and misaligned resources, simply because the Congress could not maintain regular order", Mattis said.
Twitter finds over 1000 new Russian-linked accounts
Twitter also found 13,512 Russian-related accounts that tweeted out 50,258 posts during the election period. The new IRA accounts are in addition to 2,752 accounts Twitter found and disclosed a year ago .
United States defence chief outlines the US's new security strategy, warns of diminished capability "in every domain of warfare".
The US National Defense Strategy calls North Korea a "rogue regime" that along with Iran is continuing to seek nuclear missiles, biological and chemical weapons.
The U.S. and its allies, Mattis said, are stronger together.
The document also listed North Korea among the Pentagon's top priorities, citing the need to focus USA missile defenses against the threat from Pyongyang, which beyond its nuclear weapons has also amassed an arsenal of biological, chemical, and conventional arms.
Tok said the U.S. defence strategy would have a negative impact on the USA presence in the Asia-Pacific region.
He said that concern was now outpaced by the rapid rise of China and Russia's increasing aggression.
Meanwhile, as a bill to fund the government through to only February 16 appeared on the verge of collapse in the Senate, the defence secretary had harsh words for Congress and its inability to reach agreement on budgets.
The strategy includes a three-fold effort to strengthen the US military and deter the potential for new conflicts.