President Vladimir Putin's top foreign policy aide said on Thursday a 30-day ceasefire proposed by the United States to pause the war in Ukraine would give Russia "nothing" while gifting Kyiv's forces a much-needed battlefield respite.

After more than three years of war, Ukraine has agreed to a U.S. proposal for an immediate ceasefire. The 30-day truce will come into effect if Russia signs up to the same terms, according to a joint statement from the Ukrainian and American governments.