Episode 4 of "Whiskey on the Rocks" unfolds with the arrival of Soviet Ambassador Aleksandra Kosygina at her scheduled meeting with Fälldin, yet the encounter is anything but seamless. The Swedish Foreign Minister complicates the negotiations by layering additional stipulations onto the Soviet request to install a radio mast onto the submarine. In an unforeseen turn of events, Lagercrantz, driven by his own initiative, decides to install the radio mast himself to investigate the rumored presence of nuclear material within the submarine's confines. Upon discovering traces of uranium, he hastily seeks out Fälldin, passionately urging him to declare war.
Meanwhile, in Moscow, Yuri Andropov assumes the mantle of Acting General Secretary after persuading Brezhnev to take a nap—a decision prompted by Brezhnev's erroneous identification of the submarine's location as the South China Sea. Andropov then charges Aleksandra with inspecting the submarine and verifying the crew's unwavering loyalty to the Soviet Union.
Elsewhere, Lagercrantz storms into Fälldin's office, fueled by an insistent desire to launch an immediate and comprehensive attack. However, Fälldin physically confronts him, delivering a stern warning to stand down and reiterate his unwavering commitment to resolving the crisis through diplomacy.
Aleksandra, accompanied by the Swedish commander, boards the submarine to find Captain Peskin in a state of complete disarray. In her conversation with the lieutenant, he presents a vastly differing narrative of the events, scapegoating Peskin's alcoholic indulgences for the navigational error. Desperate to save himself, the lieutenant agrees to comply with Aleksandra's every demand—provided she facilitates his and his family's relocation to Sweden. The Swedish commander is denied access to inspect the submarine, but Aleksandra requests additional time to facilitate this arrangement.
As Aleksandra and the Swedish commander disembark from the submarine, NATO forces advance and halt just a kilometer away from the Soviet vessel. This sudden maneuver alarms the Soviet forces, who brace themselves for a potential attack, the tension in the air palpable and electric.
