Trump strongly rejects international cooperation. Round 2 is underway.
Here's a timeline of Trump's actions involving international organizations and treaties, from his first term to the present.
Security & Geopolitics
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WEF says Trump to join Davos virtually after retaking White House
Børge Brende, WEF's president, said there is "a greater level of global uncertainty than we have seen in a generation."
NATO launches 'Baltic Sentry' mission to prevent undersea cable attacks
NATO officials say the threat of sabotage to energy and communications cables on the sea floor is 'a global problem.'
Ahead of its annual summit, WEF highlights geopolitical uncertainty
The post-Cold War international order is "giving way to a more fragmented landscape" that demands cooperation.
BRICS adds Indonesia to its rivalry with the G-20 for global cooperation
The group named for Brazil, Russia, India, China and South Africa targets social inclusion and global governance reforms.
The Lebanon-Israel ceasefire is built around enforcing a U.N. resolution
U.N. Security Council Resolution 1701, approved in 2006, is seen as a roadmap and the best hope for ending the war.
Organizations in times of crisis must navigate 'agenda-setting' stress
The ability to keep an important issue on the public agenda can depend on how an organization frames the debate.
Trump picks fierce U.N. critic as U.S. ambassador to the world body
U.S. Rep. Elise Stefanik will succeed career diplomat Linda Thomas-Greenfield as U.S. envoy to the U.N.
A second Trump wave is about to hit IOs. Not all have survival strategies.
Trump's second term will likely pose a serious challenge to U.N.-led efforts on climate change, global health and trade.
U.N. official: 'The entire population of North Gaza is at risk of dying'
Hospitals are attacked, health care workers detained, and men and boys are rounded up by Israeli forces in northern Gaza.
Russia defies isolation at BRICS summit joined by China and India
Some nations hope to use BRICS as a financial platform to defy the West, but the bloc also has geopolitical divisions.
At U.N., diplomats wary of regional surge in Israel-Hezbollah conflict
U.N. human rights experts condemned the 'malicious manipulation of thousands of electronic pagers and radios.'
E.U. announces loan to Ukraine is to be backed by frozen Russian assets
European Commission President Ursula von der Leyen said the E.U. would loan Kyiv up to €35 billion ($39 billion).
U.N. summit aims to bridge divides, build collective problem-solving
The summit will attempt to overcome fracture lines that have been dividing major powers and the developing world.
U.N. supports call for end to occupation of Palestinian territories
The proposal amplifies a recent International Court of Justice ruling that Israel has no sovereignty over the territories.
Probe finds 'clear and deliberate' repression in Maduro's Venezuela
U.N. investigators say Maduro's forces are using torture and sexual abuse to punish protesters and foes of his regime.