But the devil will be in the details in how both countries can move forward in an impasse that has gone beyond trade to include areas like technology, infrastructure and defence supremacy and led to talk of a "clash of civilisations". The meeting also takes place amid what some have called a digital cold war between the U.S. and China.
The sides are at an impasse after 11 rounds of talks that have failed to overcome US concerns over China's acquisition of American technology and its massive trade surplus.
At the outset of his meeting with Abe, Tusk told him the Osaka summit "will be a hard G20", given a number of global challenges in addition to those involving trade and climate change.
Trump told U.S. media that the U.S. -Japan pact unfairly puts burden on Washington.
The Trump-Xi meeting, expected to take place on Saturday, is highly anticipated as the two sides try to reach a deal on trade.
"That could set off a potential chain reaction in the region, such as South Korea acquiring its own nuclear arms, North Korea and China bulking up their existing arsenals, and Taiwan possibly joining the fray".
The coalition of more than 50 nongovernment groups, including Kiko Network and Friends of the Earth, said in a statement that Japan is one of the largest funders of coal fired-power stations overseas.
"Besides Delhi and Ahmedabad, I had the opportunity to take Prime Minister Abe to Varanasi".
On the multilateral front, the G20 leaders will address a host of other global challenges, from promoting data governance to addressing the issue of taxation in the era of e-commerce.
"But it's also important for the G20 leaders to seek common ground over those that need their longer-term commitment, including reform of the World Trade Organization and rules for the digital economy", Sugawara said.
Mr Trump has indicated a willingness to include the Huawei issue in a trade deal, despite the national security implications cited by his advisers about the company.
Japanese media reported that the Tusk and Abe made progress toward an agreement on loosening European Union restrictions on exports of farm products imposed after a 2011 nuclear accident in northeastern Fukushima prefecture.
The much-anticipated meeting at the G20 summit in Japan will be the first face-to-face meeting for the leaders since trade talks broke off in May, leading to a hike in US tariffs on imports of Chinese goods.
Japanese Prime Minister Shinzo Abe has previously suggested that Japan's constitution, brought in after its defeat in World War II, should be revised to remove a clause limiting its armed forces to a purely defensive role.
Relations between the United States and North Korea have been in the freezer since a summit in Hanoi in February failed to achieve progress on Pyongyang's nuclear programme.