Why the secrecy with Chinese Foreign Minister Wang Yi's trip to South Asia?

Chinese Foreign Minister Wang Yi made an unexpected whirlwind tour of South Asia this week, with unannounced stops in India, Afghanistan and Nepal.

The secrecy surrounding the visits comes as Beijing scrambles to drum up support against intense scrutiny by the United States and its Western allies, particularly over China's ambiguity on the Ukraine war.

Observers said the unannounced nature of the trip was highly unusual and motivated in part by Beijing's fears of diplomatic isolation.

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Wang's first stop on Monday was Pakistan, China's top ally and what Wang referred to as his "second home".

After attending as Islamabad's "special guest" a gathering of foreign ministers from more than 50 Muslim-majority nations which avoided the question of China's treatment of its Uygur minority in Xinjiang, Wang flew into Kabul on Thursday for a surprise visit.

During the brief, unannounced stopover, China's highest-level visit since the Taliban took power in August, he repeated Beijing's support for the Afghan government, a regime sanctioned by the West and yet to be officially recognised abroad.

Then it was on to India.

Neither Beijing or New Delhi announced Wang's India visit before his arrival on Thursday afternoon despite rampant Indian media speculation.

After his meeting with Wang on Friday, Indian External Affairs Minister Subrahmanyam Jaishankar confirmed that the visit was not announced before Wang's arrival at China's request.

Citing unnamed sources, Indian media reported the visit was initiated by Beijing.

China's foreign ministry only confirmed the visit on Friday evening after the meetings were over.

Wang's next stop was Nepal on Friday afternoon, a visit that was also not mentioned by Beijing.

Gu Su, a political analyst at Nanjing University, said the circumstances surrounding Wang's tour were unusual.

"It is fairly rare and difficult for Beijing to keep these kinds of high-level visits under wraps," Gu said.

Gu said it showed China was in "some kind of crisis management mode", trying to adjust its position on Russia's brutal invasion of Ukraine while stepping up diplomatic efforts to ramp up support from its neighbours.

"China urgently needs understanding and support on Ukraine at the United Nations and elsewhere amid fears of Western encirclement," he said.