Joe Biden & Vladimir Putin sought to cool tensions in the combustible US-Russian relationship at their first summit in Geneva on June 16. But the US president drew a red line at cyber attacks, declaring them "off limits”. The two leaders emerged in mostly positive moods after more than three hours of talks, including two hours alone with just the Russian foreign minister & US secretary of state. "The conversation was absolutely constructive," Putin told reporters. Putin added that they had agreed for their ambassadors to resume their posts in a gesture of diplomatic healing. Biden called the session, conducted at an elegant villa on the shores of Lake Geneva, "good, positive". While both leaders said no "threats" were issued during the talks, Biden was emphatic about warning the Kremlin over any cyber attacks against what he said were 16 clearly defined areas of US critical infrastructure. Those areas, which he did not make public, "should be off limits". Violations, Biden warned, would lead to a US response in kind, "cyber". Watch the video to know more.