Russia and Ukraine have announced that they have exchanged 115 prisoners of war each, just over two weeks after Kyiv launched a surprise incursion into Russia's Kursk region.
Ukrainian President Volodymyr Zelensky said that "another 115 of our defenders have returned home today".
While Moscow's defence ministry said: "As a result of a negotiation process, 115 Russian servicemen taken prisoner in the Kursk region have been returned from territories controlled by the Kyiv regime."
It is the first such prisoner swap since Ukraine launched its offensive inside Russia this month.
The United Arab Emirates mediated the exchange, its seventh since Russia invaded Ukraine in February 2022.
"The UAE has successfully mediated a new captives exchange between the Russian Federation and the republic of Ukraine, resulting in the release of 230 captives," said a foreign ministry statement.
Watch: Released Ukrainian prisoners of war sing national anthem
Abu Dhabi has maintained warm relations with Russia throughout the war, frustrating some western officials.
It has also strengthened ties with Ukraine.
UAE officials say that their ability to talk to a range of international actors means that they can effectively mediate between parties and promote cooperation and security.
Since the war started, the UAE, a close security partner of the United States, has mediated the release of 1,788 prisoners, including those released today.
On 6 August Ukraine's military launched a surprise attack into Russia's Kursk region, the biggest attack inside Russian territory by a foreign power since World War II.
Ukraine has said it has carved out a buffer zone in an area that Russia, which sent tens of thousands of troops into Ukraine in 2022, has used to pound targets in Ukraine.
Earlier Ukrainian President Volodymyr Zelensky said Russia wanted to "destroy" Ukraine but war has "returned to its home".
He made his comments in a Ukrainian independence day video address that he said was recorded in the border area from where Kyiv launched its surprise incursion into Russia.
Mr Zelensky said Ukraine "surprises once again" and vowed Russia will "know what retribution is".
By launching its 2022 invasion, he said: "Russia was seeking one thing: to destroy us. Instead, today we celebrate the 33rd independence day of Ukraine. And what the enemy brought to our land has now returned to his home."
"Anyone who wants to sow evil on our land will reap its fruit on their territory," he added. "This is not a prediction, not gloating, not blind revenge. It is justice."
Mr Zelensky called Russian President Vladimir Putin a "sick old man from Red Square who constantly threatens everyone with the red button".
US President Joe Biden spoke to Mr Zelensky and announced a new military aid package ahead of Ukraine's independence day, their offices said.
US Defence Secretary Lloyd Austin, who also spoke with his Ukrainian counterpart Rustem Umerov, said on social media the package was worth $125m (€111m).
In the call with Mr Zelensky, Mr Biden reaffirmed the United States support, which the White House called "unwavering", for Ukraine in its war with Russia.
The aid package includes air-defence missiles, counter-drone equipment, anti-armour missiles and ammunition, the White House said in its statement.
"Ukraine critically needs the supply of weapons from the announced packages, particularly additional air defence systems for the reliable protection of cities, communities, and critical infrastructure," Mr Zelensky said in a statement after call released by his office.
After seizing Crimea from Ukraine in 2014, Russia launched a full-scale invasion of its neighbour in February 2022. The United States has since provided military assistance and aid to Ukraine while also imposing sanctions on Russia over the invasion.
The US has provided Ukraine with more than $50bn (€44bn) worth of military aid since 2022.
Separately, the United States imposed sanctions on more than 400 entities and individuals for supporting Russia's war effort in Ukraine, including Chinese companies that US officials believe are helping Russia skirt Western sanctions and build up its military.
