President Xi Jinping has called for "more voices" to end the Ukraine war and a ceasefire in Gaza, as he conducted a state visit to Brazil's capital.

Xinhua news agency said Xi wanted to see "more voices committed to peace to pave the way for a political solution to the Ukraine crisis" and "a ceasefire and an end to the war at an early date" in Gaza.

Xi made the appeal during a state visit to Brasilia, where he was hosted by Brazilian President Luiz Inacio Lula da Silva.

Beijing and Brasilia have advanced a joint roadmap for peace in Ukraine that has been endorsed by Moscow but rejected by Kyiv.

"In a world plagued by armed conflicts and political strife, China and Brazil put peace, diplomacy and dialogue first," Lula said.

Xi's appeal for a halt to fighting in Gaza - where Israel is pressing an offensive against Hamas - echoed one he and the other G20 leaders made during a summit held Monday and Tuesday in Rio.

That summit's joint statement called for a "comprehensive" ceasefire in both Gaza and Lebanon, where Israel is also waging an offensive against the Iran-backed Hezbollah group.

Xi's state visit to Brasilia showcased closer relations between the biggest economies in Asia and Latin America.

The two leaders signed 35 cooperation accords on areas including agriculture, trade, technology and environmental protection.

Xi said China-Brazil relations "are at their best in history" and the two countries are now "reliable friends," according to Xinhua.

Lula said he looked forward to welcoming Xi to Brazil again next July for a Brics summit.

Xi's visit to Brazil's capital comes fresh off his attendance at a G20 summit in Rio de Janeiro, and an Apec summit last week in Lima, Peru.

The Chinese leader figured prominently at both summits, in contrast with outgoing US President Joe Biden, who cut a spectral figure as fellow leaders looked past him, politically, to the coming presidency of Donald Trump.

That difference also spoke to China's ascendant role as a trade partner and investor in Latin America, and expectations that America under Trump will erect trade and migration barriers.

Lula welcomed Xi with full honours, greeting him on the red carpet as horse-mounted guards rode past, a military brass band played their national anthems, and lines of children waved Chinese and Brazilian flags. (Agencies)