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https://www.politifact.com/article/2020/oct/29/tony-bobulins... includes what the WSJ found:

The Wall Street Journal reviewed his documents and found no evidence of wrongdoing by Joe Biden — or that he was active in his family’s foreign business endeavors, as Bobulinski claimed.

Bobulinski’s overarching claim is that Joe Biden was involved in, and may have profited from, his son and brother’s business dealings in China. He called Joe Biden’s claim that he never played a role in Hunter Biden’s foreign business endeavors "a blatant lie."

But the Journal reported that the text messages and emails Bobulinski shared from 2017 "don’t show either Hunter Biden or James Biden discussing a role for Joe Biden in the venture."

The venture in China "never received proposed funds from the Chinese company or completed any deals, according to people familiar with the matter," the outlet reported. "Corporate records reviewed by The Wall Street Journal show no role for Joe Biden."

The Journal also quoted Gilliar, the British national involved in SinoHawk, as saying he was "unaware of any involvement at any time of the former vice president." Gilliar added that "the activity in question never delivered any project revenue."