Jake Sullivan, the US national security adviser, has spoken about the details of Joe Biden's talks with Ukrainian President Volodymyr Zelenskyy in Kyiv.

"They spent time talking about the coming months in terms of the battlefield, what Ukraine needs, the capabilities to be able to succeed on the battlefield. They talked about Ukraine’s needs in terms of energy, infrastructure, economic support, humanitarian needs, and they also talked about the political side of this, including the upcoming UN General Assembly session on Ukraine, as well as Ukraine’s peace formula and Ukraine’s efforts to rally international support for a just and sustainable and durable peace built on the principles of the UN Charter, chief among them sovereignty and territorial integrity," The Guardian quotes Sullivan.

When asked whether Biden and Zelenskyy had spoken about weapons systems, particularly F16 fighter jets, that might be provided to Ukraine, Sullivan was opaque.

"I think the two presidents both laid out their perspectives on a number of different capabilities that have been thrown around in the press, both recently and over the course of several months, and I will leave it at that," he said.

As reported, Biden only decided to make a risky visit to Kyiv on Friday after getting briefed by his national security team.

American officials had contacted Russia shortly before Joe Biden's departure from Washington to avoid any miscalculation that could bring the two nuclear-armed nations into direct conflict.

As reported, US President Joe Biden, during his visit to Kyiv, announced a new package of US military assistance and additional sanctions against Russia for its aggression.