Ukraine said on Monday that its air defenses had shot down eight drones launched by Russia in overnight strikes.
The Ukrainian Air Force said drones were destroyed in several regions of the country, including Mykolaiv, Dnipropetrovsk, Khmelnytskyi and Rivne.
In addition to the drones, the Russian attacks included three S-300 missiles.
Ukrainian President Volodymyr Zelensky said on Sunday that it was crucial to see "increased resilience in the supply of our defense coalitions with weapons, ammunition and vehicles."
His comments followed those of NATO Secretary General Jens Stoltenberg, who warned that if Ukraine does not continue to receive the support it needs to fight Russia outside its country, the United States, Europe and the rest of the world will be more vulnerable.
Such a scenario would also encourage other authoritarian regimes in other parts of the world to seize land, Stoltenberg said.
During a TV interview with Fox News, Stoltenberg also said Beijing is closely monitoring NATO's response to Putin's invasion of Ukraine. "Today it is Ukraine, tomorrow it could be Taiwan," said the head of NATO.
Stoltenberg, responding to the question of whether the NATO 2024 military exercises, the largest since the Second World War, could provoke a response from the forces of Beijing and Moscow, said that the North Atlantic Alliance should prevent, not cause, war.
NATO operation
In Operation Steadfast Defender 24, around 90.000 NATO personnel will participate in a series of exercises across Europe in the coming months. 50 naval vessels, 80 aircraft and more than 1.100 combat vehicles will be involved.
The exercises will "demonstrate that NATO can conduct and sustain complex multi-domain operations over several months, over thousands of kilometers, from the far north to central and eastern Europe, and in any condition," the 31-nation alliance said.
Stoltenberg is meeting with top US defense officials and lawmakers this Sunday to call for continued funding for Ukraine, which is currently deadlocked in Congress over US border policy and other political issues.
Aid to Ukraine remains divisive, with critics skeptical of Kiev's ongoing fight against corruption.
Ukraine's security service, the SBU, said Saturday that employees of a Ukrainian arms company conspired with officials to embezzle nearly $40 million intended for mortar shells to wage war with Russia.
The agency announced that five people were charged, and one was detained while trying to leave the country. The five could face up to 12 years in prison.
The country's attorney general said the funds had been seized and would be returned to Ukraine's defense budget.
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