European nations have rallied behind Ukraine, saying peace in the war-torn nation can't be resolved without Kyiv, ahead of an upcoming meeting between U.S. President Donald Trump and Russia's Vladimir Putin in Alaska.

Oil fell after its biggest weekly drop since end-June before a meeting between the US and Russian leaders on Friday, which is raising the prospect of an end to the war in Ukraine and more supply.

Since President Trump retook office, many Ukrainians have worried a peace accord would be struck without them.