When the british prime minister winston churchill visited missouri with president truman, what did he warn the u. s. about?

He warned of imminent danger of ww3

 Churchill, who had surprisingly lost in the parliamentary elections, had been invited to the college in Missouri, where he cited the escalated threat from soviet union expansionism in eastern Europe and east Germany as heralding the need for America and Britain to unite.

What are they! i have no idea lol