The United States and Britain pledged nearly US$1.5 billion in additional aid to Ukraine on Wednesday during a visit to Kyiv by their top diplomats as Ukrainian officials renewed their pleas to use Western-provided missiles against targets deeper inside Russia.

US Secretary of State Antony Blinken announced more than US$700 million in humanitarian aid, while British Foreign Secretary David Lammy confirmed that his country would provide another US$782 million in aid and loan guarantees. Much of the effort was aimed at bolstering the energy grid that Russia has repeatedly pounded ahead of an expected difficult winter.

Blinken and Lammy travelled together to the Ukrainian capital on a rare joint tour to underscore their commitment to the country in its war. Two air-raid sirens sounded during the visit, causing delays in their schedule, including forcing them to cancel a wreath-laying ceremony.

Blinken said he would take the discussion about the missiles “back to Washington to brief the president”.

“Speaking for the United States, we have adjusted and adapted as needs have changed, as the battlefield has changed. And I have no doubt that we’ll continue to do that as this evolves,” Blinken told a news conference.