Thorny global issues abound a year into the Trump Presidency.
NORTH KOREA
In January 2017, days before entering the Oval Office, Trump tweeted that North Korea's claims to be close to producing a nuclear weapon capable of reaching the United States were untrue - "It won't happen!"
After waging a war of words with Kim Jong Un by dubbing him "rocket man" and the North Korean leader calling Trump "mentally deranged," Trump threatened to "unleash fire and fury like the world has never seen."
Escalating tensions on the Korean Peninsula dominated the headlines in Trump's first year as president, as the US managed to push through four rounds of sanctions against the nation in the UN Security Council, compared to six in the previous ten years.
Kim claimed his country's nuclear missiles could reach the US in his address on New Year's Day, prompting Trump to tweet that his own nuclear button was "much bigger & more powerful" than the North Korean leader's.
After long-awaited talks between the two Koreas yielded hopeful results, such as Pyongyang's participation in the upcoming Pyeongchang Winter Olympics next month, Trump took credit for the thaw.
"With all of the failed 'experts' weighing in, does anybody really believe that talks and dialogue would be going on between North and South Korea right now if I wasn't firm, strong and willing to commit our total 'might' against the North," he wrote.
THE ART OF THE DEAL
Trump made moves to roll back or renegotiate some of Obama's signature deals - as well as one from more than a quarter of a century ago.
The withdrawal from the Paris climate agreement was met with dismay from world leaders, and most of the rest of the world continued to focus on global warming as a top priority - and warned the US would be left behind.
Trump's decision to decertify the Iran nuclear deal, a landmark agreement often billed as one of the greatest diplomatic achievements of the century, has left world leaders fearing the US will back out completely.
In that case, Iran has said it would leave "in no time flat," leaving the global community faced with two rogue nuclear nations - Iran and North Korea.
Trump is required to endorse the deal every 90 days and approve waivers of US sanctions on Iran every 120 and 180 days, meaning the deal is constantly hanging in the balance.
The White House has reopened negotiations on the NAFTA free trade deal with Canada and Mexico, which came into force in 1994.
Canada's Foreign Affairs Minister Chrystia Freeland said Ottawa is taking Trump's threats to pull out seriously and preparing for a possible US withdrawal, as the sixth round of talks are due to start on January 23.
Experts have argued that if the US keeps pulling out of deals, it will damage its credibility as a reliable nation on the world stage.
JERUSALEM
In what was widely seen as a last-ditch snub from Obama, the US made the unusual move of allowing the passage of a UN Security Council resolution condemning Israeli settlements in the West Bank last December.
But under Trump, the US pulled out of the UN cultural agency UNESCO, citing "anti-Israel bias" and decided to officially recognise Jerusalem as Israel's capital and move the US embassy there, triggering an outbreak of violent clashes between Israelis and Palestinians.
And the diplomatic firestorm that ensued prompted two votes at the UN criticising the move - the second of which saw 128 countries call for Trump to change his mind.
Trump responded by threatening to cut funds to countries who didn't back the US in the vote, and US Ambassador to the UN Nikki Haley said she would be "taking names."
RUSSIA
During his campaign, Trump expressed admiration for Russian President Vladimir Putin and pledged to rebuild the countries' frayed ties.
Trump and Putin have spoken multiple times by telephone and met in person, but the administration has not established the cosy relationship anticipated by some.
The US has sanctioned numerous Russian officials and businesses over Russia's annexation of neighbouring Ukraine's Crimea region in 2014 and its continuing support for rebel groups waging war in Ukraine's east.
The optics of the US-Russia relationship are also delicate, as US authorities have also accused Russia of meddling in last year's US presidential election to get Trump into office.
Trump maintains there was "no collusion" between his camp and Russia and has said the ongoing Russia investigation makes the US look foolish and he hopes it will be over soon.
