The Ukrainian command said its forces killed more than 100 Russian troops in the southern Kherson region. Reuters could not independently verify the battlefield reports.
The activity on Tuesday was less intense than the day before when dozens of strikes killed 19 people, wounded more than 100 and knocked out power across the country in Moscow's biggest aerial offensive since the start of its invasion on Feb. 24.
More missile strikes on Tuesday killed seven people in the southeastern town of Zaporizhzhia, a presidential aide said, and left part of the western city of Lviv without power.
Ukrainian Defence Minister Oleksii Reznikov celebrated the arrival from the United States of what he said were four additional High Mobility Artillery Rocket Systems (HIMARS), whose accuracy and longer range have allowed Ukraine to reduce Russia's artillery advantage.
"HIMARS time," he wrote on Twitter, was a "good time for Ukrainians and bad time for the occupiers."
Ukraine on Tuesday received the first of four IRIS-T air defence systems Germany promised to supply, a German defence ministry source said. The United States said it was speeding up the shipment of NASAMS air defences to Ukraine. Washington has already provided more than $16.8 billion worth of security aid to Ukraine during the war.
'UNCONTROLLED ESCALATION'
The G7 - which groups the United States, Germany, France, Japan, Britain, Italy and Canada - pledged continued "financial, humanitarian, military, diplomatic and legal support ... for as long as it takes" to Ukraine, it said in a statement.
It also condemned "indiscriminate attacks on innocent civilian populations" as war crimes and said Putin would be held to account for them.
Moscow, which calls its actions in Ukraine a "special military operation" to eliminate dangerous nationalists and protect Russian speakers, has accused the West of escalating and prolonging the conflict by supporting Kyiv.
Kyiv and its Western backers accuse Russia of an unprovoked land grab in Ukraine. And Zelenskiy on Tuesday again ruled out peace talks with Putin.
In an interview on state television, Russian Foreign Minister Sergei Lavrov said Moscow was open to talks with the United States or with Turkey on ways to end the war, now in its eight month, but had yet to receive any serious proposal to negotiate.
Washington dismissed such offers as "posturing".