(ANSA) - BELGRADE, SEP 4 - US President Donald Trump told European leaders that they must stop buying Russian oil, which he claims is helping Moscow finance its war against Ukraine, according to Reuters, citing a White House official. The US President, who participated in the "coalition of the willing" call, also emphasised that European leaders must exert economic pressure on China because it funds Russia's war efforts, according to the same source. According to Trump, Moscow receives 1.1 billion euros per year from the EU through fuel sales. (ANSA).