Chinese President Xi Jinping called for a return to “unity and harmony” on Thursday as he welcomed gas-rich Qatar’s emir to Beijing, amid a dispute that has seen some Arab states led by Saudi Arabia severing relations with Doha.

Saudi Arabia, the United Arab Emirates, Bahrain and Egypt cut diplomatic, trade and transport ties with Qatar in June 2017. They accuse Qatar of supporting terrorism and cultivating ties with Saudi Arabia’s regional foe, Iran.

Qatar, which denies the charge, says the boycott seeks to curtail its sovereignty, while the row has defied mediation efforts by Kuwait and the United States which sees Gulf unity as essential to containing Iran.

The rift has shown no sign of being resolved soon. Qatar has been bolstering ties with its supporters, such as Turkey, with trade between those two expected to have risen by more than half in 2018.

China has largely stayed out of the dispute, calling for the problem to be resolved via talks, though has played host to senior Qatari officials since the spat began, including in December to Qatar’s foreign minister.

Meeting in Beijing’s Great Hall of the People, Xi told Sheikh Tamim bin Hamad Al Thani that regional cooperation was an important basis for prosperity in the Gulf region, Chinese state television reported.

China supports the efforts of the Gulf Cooperation Council to seek an “appropriate resolution to disputes and contradictions via political and diplomatic means, to return unity and harmony between Gulf and Arab countries”, Xi said.

“China is willing to continue to play a constructive role according to the wishes of the Gulf Cooperation Council countries,” Xi added, according to the report, which did not make direct mention of the Gulf rift.

“Old Friend”

In remarks in front of reporters, Xi called Al Thani “an old friend and a good friend”.

Xi said the two sides will continue to boost cooperation in tourism, culture, sports and media exchanges, especially in supporting each other to host the 2022 Winter Olympic Games in Beijing and the FIFA World Cup in Qatar.

During the meeting, Tamim extended his sincere New Year greetings to President Xi and the Chinese people.

He noted that Qatar was one of the first countries to support the BRI when it was launched in 2013. Qatar has full confidence in the Chinese economy, Tamim said, noting his country is willing to cooperate with China in a wide range of areas.

The performance of Chinese companies in Qatar is commendable, he said, adding Chinese companies are welcome to invest in the country. He also said that Qatar is willing to strengthen communication and coordination with China in anti-terrorism and anti-extremism.

Al Thani told Xi that he was very happy with their personal friendship.

“We are ready to have bigger investments in China, in infrastructure or in any other field we see as important for us,” he said.

“We are happy to provide China with liquid gas and we are ready to provide China with more in the near future. I am very happy to be in China.”

Last October, state energy giant Qatar Petroleum said it had signed a five-year agreement to supply China with 600,000 tonnes of Liquefied Petroleum Gas (LPG) per year.

Qatar’s state news agency said Al Thani and Xi had signed memorandums of understanding on diplomatic training, future trade delegations, and the creation of a road map for Qatar to take part in China’s Belt and Road initiative, an expansion of infrastructure and trade links worldwide.

Earlier in January, state-owned Qatar Airways said it had acquired a 5 percent stake in China Southern Airlines, in a move to gain access to the fast-growing Chinese market.

China has traditionally played little role in Middle East conflicts or diplomacy, despite its reliance on the region for oil, but it has been trying to raise its profile, especially in the Arab world. Saudi Arabia’s King Salman visited Beijing in 2017.

However, China has had to walk a fine line, as it also has close ties with both Iran and Israel.