More than 40 people were killed and 180 injured in the attack.
Ivan Rossomakhin was recruited from prison in 2022, committed another killing while on leave in Russia and was sent back to the frontline.
Zelenskyy expressed gratitude to the Ukrainian troops who helped replenish the pool of prisoners for exchange.
Indian Prime Minister Narendra Modi will visit Ukraine on Friday, officials said, weeks after Kyiv condemned him for hugging President Vladimir Putin during a visit to traditional ally Russia. New Delhi's foreign ministry said on Monday Modi will visit Poland on Thursday before travelling on to Ukraine the next day.
The biggest attack on Russian soil since World War II has rattled Russia and penetrated several kilometres into Russia's Kursk region. President Volodymyr Zelensky said Ukraine now controls over 1,250 square kilometres (480 square miles) and 92 settlements.
Ukraine could soon unleash robot dogs on its front lines, replacing soldiers for perilous missions like spying on Russian trenches or detecting mines.
The attack on the Olenivka facility in the eastern Donetsk region overnight on July 29 two years ago left at least 50 Ukrainian prisoners dead and wounded at least 130, Kyiv says.
Russia stated that its military deployed MiG-29 and MiG-31 fighter jets, which identified the U.S. aircraft as B-52H strategic bombers.
The United States foiled a Russian plot earlier this year to assassinate the chief executive of a major German arms maker supplying weaponry to Ukraine, CNN reported on Thursday.
With relations between NATO on the one hand and China and Russia on the other at a low ebb, analysts believe that Beijing wanted to send the alliance a warning message with the timing of the drills.
Britain's Prime Minister Keir Starmer indicated on Wednesday that Ukraine can use long-range missiles supplied by the UK to strike military targets in Russia during their war.
Ukraine is set for a fiery clash with Russia at the UN Security Council Tuesday after Kyiv's allies called for an emergency meeting in the wake of deadly strikes by Moscow.
Chinese President Xi Jinping told Hungarian Prime Minister Viktor Orban on Monday that world powers should help Russia and Ukraine re-start direct negotiations during a visit to Beijing branded a "peace mission" by the European leader.
Russian strikes on the eastern Ukrainian city of Pokrovsk killed five people and wounded dozens more on Monday, the governor of the Donetsk region said.
The targeted aerial barrages over recent months have crippled Ukrainian electricity generation capacity and forced officials to impose rolling blackouts and import supplies from neighboring EU states.
Harris made the announcement at the Ukraine peace summit in Lucerne, Switzerland, where she met with Ukraine President Volodymyr Zelenskiy.
Group of Seven leaders have agreed to provide Ukraine with $50 billion via the use of frozen Russian assets by the end of the year, the French presidency said on Wednesday.
As President Biden's administration faces mounting scrutiny, dissent within the State Department highlights concerns over America's stance on international conflicts.
NATO chief Jens Stoltenberg and Hungarian Prime Minister Viktor Orban agreed on Wednesday that Budapest would "not block" the defense alliance from contributing more to Ukraine's fight against Russia's invasion.
The expanded measures, which are likely to be announced Wednesday, are part of the Biden administration's efforts to stop Russia's attempts to bypass Western sanctions and diminish its war capabilities against Ukraine.
Ukraine on Thursday ordered the evacuation of children and their guardians from several towns and villages in the eastern Donetsk region, where fighting with Russia is intensifying.
Zelenskyy will deliver an in-person speech at the Shangri-La Dialogue, considered Asia's premier defense summit.