On June 4, 1961, the president met with Khrushchev in Vienna and left the meetings angry and disappointed that he had allowed the premier to bully him, despite the warnings he had received. Khrushchev, for his part, was impressed with the president's intelligence, but thought him weak. Kennedy did succeed in conveying the bottom line to Khrushchev on the most sensitive issue before them, a proposed treaty between Moscow and East Berlin. He made it clear that any treaty interfering with U.S. access rights in West Berlin would be regarded as an act of war.