Moscow said no "Christmas ceasefire" was on the cards after nearly 10 months of war in Ukraine, rejecting a call by Kyiv to start withdrawing troops by Christmas as a step to end Europe's biggest conflict since World War Two, Reuters reports.
Russia and Ukraine are not currently engaged in talks to end the fighting, which is raging in the east and south with little movement on either side.
Violence returned to Kyiv on Wednesday, with the first major drone attack on Ukraine's capital in weeks. Two administrative buildings were hit, but air defences largely repelled the attack. Ukrainian President Volodymyr Zelensky said 13 drones had been shot down.
In one Kyiv district, where snow lay on the ground, residents said they heard the loud whirring engine of an Iranian Shahed drone followed by a powerful explosion at a building next to their homes.
"I want this all to be over ... For (Russian President Vladimir) Putin, that bastard, to die," said Yana, 39, who had been getting ready for work when the attack took place.
Tens of thousands of people have been killed, millions more displaced and cities reduced to rubble since Russia invaded its neighbour on Feb 24, saying it needed to protect Russian speakers from Ukrainian far-right nationlists. Kyiv and its allies call it an unprovoked war of choice.
"There is no calm on the front line," Zelensky said in a regular evening video address, describing Russia's destruction of towns in the east with artillery: "So that only bare ruins and craters" remain.
Zelensky said this week that Russia should start withdrawing by Christmas as a step to end the conflict, but Moscow rejected the proposal, saying Ukraine must accept the loss of territory to Russia before any progress can be made.
"Just given what we're seeing in the air and on the ground in Ukraine, it's difficult to conclude that this war will be over by year's end," White House national security spokesperson John Kirby said in response to a question about the prosects for a negotiated peace.
Russia, which calls the war a "special military operation", has fired barrages of missiles on energy infrastructure since October, distrupting power supplies and leaving Ukrainians without heating in freezing winter conditions.
In Paris, about 70 countries and institutions this week pledged just over 1 billion euros ($1.1 billion) to help maintain Ukraine's water, food, energy, health and transportation in face of Russia's attacks.
US officials said this week that an announcement on a decision on providing the Patriot missile defence system to Ukraine could come as soon as Thursday - a move which would significantly bolster Ukraine's air defence.
The Kremlin said US Patriot systems would be legitimate targets and warned that Washington was getting "deeper and deeper into the conflict in the post-Soviet republic".
PRISONER SWAP
Despite the lack of peace talks, hundreds of detainees have been freed in swaps in recent weeks. The releases - along with progress on talks to resume Russian exports of an ingredient in fertiliser and the extension of a grains deal - have shown the two sides maintain at least limited contact on several levels.
The latest exchange of dozens of detainees included a US citizen, Kyiv and Washington said on Wednesday.
The head of Ukraine's presidential administration, Andriy Yermak, identified the American as Suedi Murekezi, who he said had been "helping our people" before ending up in Russian custody. The Washington Post said Murekezi was a US Air Force veteran born in Uganda.
"We certainly welcome that news," Kirby told reporters, but did not name the freed American, citing privacy concerns.
The head of the International Committee of the Red Cross said on Wednesday an all-for-all prisoner of war swap deal was an option in the Ukraine-Russia conflict. The ICRC emphasised it was up to the two countries to reach an agreement on the issue.
ICRC President Mirjana Spoljaric said a major swap could build confidence and that such exchanges had in the past constituted "the first step to a broader agreement".
Neither the Red Cross or the two sides have made public precise numbers for each country's war detainees but there are believed to be thousands of such prisoners.
Ukraine has pushed for more captives to be returned as part of talks with Russian representatives seeking the reopening of an ammonia gas pipeline through Ukraine. The pipeline is widely seen as important to lowering world prices for fertilizer made with the gas.