According to the diplomat, the contradictory statements may be part of Washington's negotiating tactics TEHRAN, June 1. /TASS/. The US’ constant shifts in position and introduction of new demands are delaying the negotiation process, Iranian Foreign Ministry Spokesman Esmaeil Baghaei stated. "When the other side constantly changes its views, puts forward new or contradictory demands, and sends out various contradictory messages through the media, it naturally leads to delays in the negotiation