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At least one person died and several were injured in an overnight Russian drone strike on Kyiv, authorities said.
Roughly a dozen Iran-made drones were shot down over the city's airspace, according to Kyiv military officials.
It was the third night of attacks in a row on the capital, coming just hours after the end of the Nato summit in Lithuania.
Debris was reported in five districts and at least two people were sent to hospital with shrapnel wounds.
Mayor Vitali Klitschko said a one body was found in an apartment building in Podilsky district, north of central Kyiv.
The previous two days' Nato summit in Vilnius saw Western support for Ukraine at the top of the agenda.
Mr Zelensky used his attendance to push for Ukrainian membership of the alliance, but was told this would only be possible "when allies agree and conditions are met".
This lack of a solid timeframe appeared to anger the Ukrainian president, who called it "absurd". He had earlier said there seemed to be "no readiness" to invite Ukraine to Nato or make it a member.
He also expressed concern that Ukraine's membership could be used as part of a bargaining chip during post-war negotiations with Russia.
But by the end of the summit, Mr Zelensky had a more optimistic take on developments.
In his nightly address on Wednesday, he said he was returning home "with a good result for our country", namely a reinforcement of weapons as well as a path towards Nato membership.
"We have put to rest any doubts and ambiguities about whether Ukraine will be in Nato - it will," he said, adding that for the first time "a significant majority" of members are "vigorously pushing" for it.
He also praised the signing of a wide-ranging security pact with G7 members, saying his country now had "concrete security guarantees" from the world's leading democracies.
Speaking at the summit, US President Joe Biden also praised Nato unity, something he said Russian President Vladimir Putin had underestimated when he launched his invasion against Ukraine.
"He was betting Nato would break apart. He thought our unity would shatter at the first testing. He thought democratic leaders would be weak. But he thought wrong," he said.
Meanwhile, a Russian general, Ivan Popov, said he had been dismissed as a commander after telling the military leadership about dire conditions on the front line, which he said they did not want to hear.
Gen Popov, who commanded the 58th Combined Arms Army in Zaporizhzhia region, reportedly said Russian soldiers had been stabbed in the back by the failings of the top military brass.
There was no immediate comment from the Russian defence ministry.