Buenos Aires, Nov 30 (Just News): World leaders are meeting in Argentina for their annual G20 summit amid new tension with Russia over Ukraine and a US trade row with China.
US President Donald Trump has cancelled a meeting with his Russian counterpart, Vladimir Putin, in protest at Russia's seizure of Ukrainian naval boats.
But ahead of the summit's official start Mr Trump signed a trade deal with the Mexican and Canadian leaders.
A massive security operation is under way for the summit in Buenos Aires.
A bank holiday has been declared for Friday and the city's main business district has been shut down.
Speaking before the signing of the US-Mexico-Canada Agreement (USMCA) - to replace the Nafta free trade deal - Mr Trump described it as "probably the greatest trade deal ever".
"All of our countries will benefit greatly," he said.
What is going to be talked about at the summit?
Hopes of progress over tariffs in Mr Trump's expected talks with Chinese leader Xi Jinping have been dampened.
The two economic giants are locked in a trade war, which may possibly even escalate.
Climate change promises to be another major sticking point in the talks.
French President Emmanuel Macron was quoted by AFP news agency as saying he would refuse to sign a trade deal with South America's Mercosur bloc if Brazilian President-elect Jair Bolsonaro withdrew from the Paris climate accord.
The summit is also a diplomatic test for Saudi Crown Prince Mohammed bin Salman amid continuing questions about the Saudi state's possible involvement in the murder last month of journalist Jamal Khashoggi in Turkey.-BBC
