US President Donald Trump says he's the least racist person he knows.

OPINION: When Donald Trump was elected America's 45th president in November 2016 the world took a collective deep breath.

This was a man derided by his critics as an isolationist, woefully out of his depth on foreign policy matters, and imbued with a supposedly dangerous and reckless nationalism.

European leaders queued up to condemn the new leader of the free world in the court of international opinion.

SUPPLIED He might look like a fool on the world stage, but Donald Trump's foreign policy has been ruthlessly effective.

But a year into his presidency Trump's actual record has been far more effective than his detractors predicted.

"America First" has not resulted in a US withdrawal from the world.

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SUPPLIED Donald Trump was supposed to be woefully out of his depth on the international stage.

Far from it.

The White House's new National Security Strategy (NSS), unveiled by Trump himself in December, was loudly attacked by Vladimir Putin's regime as an aggressive statement of intent on the world stage by the US administration.

The first NSS since 2015, it outlines the big-picture strategic thinking of the Trump presidency and, in marked contrast to the previous Obama-era document, places heavy emphasis upon national sovereignty, self-determination, and control of borders.

GETTY IMAGES If Putin thought he was getting a friend in the White House, Trump's foreign strategy suggests otherwise.

British supporters of Brexit can relate to that.

A pro-British Eurosceptic himself, Trump is a genuine believer in the value of the Anglo-American Special Relationship - and likes to stand with all America's traditional allies.

In the Middle East, partnerships between the United States and Israel, Saudi Arabia and Egypt have all been reinvigorated.

In Asia, he has bolstered alliances with Japan and Taiwan, much to the dismay of Beijing.

And in Europe the administration has boosted the relationship with Poland, the rising power of Eastern Europe, and placed greater emphasis on working with national capitals than the EU.

Following pressure from Washington, defence spending among Nato allies is increasing for the first time in decades.

When Trump entered the White House a year ago, Europe feared he would embark upon a pro-Russian trajectory, yielding to Moscow's efforts to enhance its power in its "Near Abroad".

The reality has been remarkably different and the message to America's allies living in the shadow of the Russian bear is loud and clear: the United States will fight to defend Europe against any Russian attempt to threaten Nato territory.

So the Trump presidency has expanded US troop presence in the Baltics, supplied anti-missile systems to Poland and even declared its intent to send defensive weapons to Ukraine.

Of course, there is room for improvement in Trump's foreign policy.

In the face of mounting Russian aggression, the president should match his administration's tough policy positions with a willingness personally to confront Vladimir Putin directly about his activity in Crimea and Ukraine.

But if Putin believed he would have a friend in the White House he was sorely misguided.

The Trump administration has increased sanctions against Moscow, and challenged Russian hegemony in Syria.

And it has been in Syria and Iraq that Trump has most strikingly demonstrated decisive American leadership.

A staggering 98 per cent of Islamic State of Iraq and the Levant (Isil) territory in those two countries has been recovered by the US-led coalition, with five million people liberated in the past 12 months alone.

The sheer speed of Isis's defeat has owed much to Trump's decision to free the US military from combat restrictions put in place by the overly cautious Obama White House.

And while there remains the need for a more coherent US strategy in dealing with North Korea, on the Iran front, Trump has rightly pushed for a strengthening of the nuclear agreement.

The president may lack the eloquence of John F Kennedy, or the ideological drive of Ronald Reagan, but he has demonstrated an uncompromising willingness to defend the interests of his country, reassure allies, aggressively confront America's enemies and ensure the United States continues to lead as the world's superpower.

He has emphatically banished the Obama era of "leading from behind" while putting an unapologetically American stamp on the world stage.

* Nile Gardiner is a Director of the Margaret Thatcher Centre for Freedom.