Donald Trump Jr. had private talks in Paris last month that partly related to working with Russia to end the ongoing war in Syria, The Wall Street Journal reported Wednesday.

The event, hosted by a French think tank, featured diplomats, businessmen and politicians. The think tank's founder, who was born in Syria, has worked with Russia to end the civil war and seeks a political transition with the cooperation of President Bashar Assad, a close ally to Russia, according to the newspaper.

President-elect Donald Trump has been criticized for his willingness to cooperate more fully with Russia when he takes office. Tensions between Moscow and Washington rose in recent years, partly due to disagreements about how best to resolve the Syrian conflict and Russia's involvement in Ukraine.

Throughout the presidential campaign, Trump and his top advisors also faced questions about their contacts with foreign powers.

Trump advisor Kellyanne Conway confirmed to the Journal that the president-elect's eldest son, attended the meeting but played down his involvement in it.

Read the full Wall Street Journal report here.