"I expect (US president Donald) Trump to be very warm with him, but European leaders probably are going to be very reluctant to have their pictures taken with him".
"I think the most likely scenario is that [Chinese President] Xi Jinping doesn't offer big enough concessions to Trump, and so nothing much comes of the G20 meeting", said Julian Evans-Pritchard from Capital Economics.
But the Kremlin said it remained on the calendar, as Putin defended the action.
"If they did make the smartphones in the USA, it would add somewhere between 20% to 35% more to the final consumer prices of the phones sold to the public", Creative Solutions president Tim Bajarin said.
US President Donald Trump headed to Argentina Thursday for a fractious weekend of G20 summitry, cancelling planned talks with Russia's leader and boasting that his trade war with China was paying off.
China's head however has vowed that China would boost protection of intellectual property.
Trump didn't elaborate further.
The US has hit a total of $250bn of Chinese goods with tariffs since July, and China has retaliated by imposing duties on $110bn of US products.
"As Prime Minister I will prosecute this case again at the G20, as I did at the APEC and [East Asia] summits".
"If we do not show concrete progress, our global meetings become useless and even counterproductive", he said.
The United States has cast talks Saturday with Xi as a deadline for China to cave on key trade concerns of Trump, who has slapped $250 billion in tariffs on the Asian power.
U.S. Trade Representative Robert Lighthizer is examining all available tools to raise U.S. tariffs on Chinese vehicles to the 40 percent duties that China is now charging on U.S. -produced vehicles.
The highly anticipated dinner between the two leaders, set for Saturday, will occur on the sidelines of the G-20 summit in Argentina.
Among a wide range of issues on the table for the gathering of leaders of G-20 countries, the 13th since the first one took place in 2008 in response to the global financial crisis, global trade will be in the spotlight.
Some administration officials have been arguing that hitting allies such as the European Union and Japan with tariffs at the same time as Trump is soliciting their help in taking on China would be counter-productive.
France fears that Mr Trump will block or eclipse any progress at the G20.
But an Argentine advertising company refused to erect the poster, Emine Dzhaparova, Ukraine's deputy information minister, said in Buenos Aires.
"My key message at the G20 will be that to enjoy the prosperity, security and connectedness we have today, we must protect the worldwide system", Mr Morrison said. I'm open to making a deal. "We have briefed the Prime Minister's Office on the current state of play the World Trade Organization where multiple challenges to India's subsidy program have been launched by USA authorities even as it spearheads efforts to deny a permanent solution to the question of public stockholding of foodgrains", a Commerce Department official said.
The president has also repeatedly said that should a deal not be reached, his administration stands ready to further escalate the US tariffs imposed on China.
"We can not pretend that ongoing trade tensions do not pose real threats to the global economy", he said.
May is expected to use the G20 to sell Britain's post-Brexit trading future outside the EU.
But Trump has done her no favours by mocking a hard-fought withdrawal agreement negotiated between London and Brussels, and May still has to win backing for the deal from the fractious British parliament.