Biden was visiting newest NATO member Finland a day after a summit in Vilnius in which the Western military alliance pledged its backing for Kyiv but failed to offer it a timeline for membership.
Moscow's riposte came in the form of its latest aerial assault on Ukraine, with Kyiv saying early Thursday it had destroyed 20 Russian attack drones and two cruise missiles.
At least four people were wounded in the capital, where most of the Iranian-made drones were destroyed, Kyiv's mayor said.
In a sign of its anger at Western backing for Kyiv, Moscow said it would regard F-16 fighter jets sent to Ukraine as a "nuclear" threat because of their capacity to carry atomic bombs.
"Russia cannot ignore the ability of these aircraft to carry nuclear weapons. No amount of assurances will help here," Foreign Minister Sergei Lavrov was quoted as saying by the Russian foreign ministry.
The Netherlands and Denmark are leading a plan to train Ukrainian pilots on using the US-made aircraft as part of an 11-nation coalition, after Washington authorised the move.
Russia has repeatedly engaged in nuclear rhetoric since its February 2022 invasion of its pro-Western neighbour Ukraine.
- 'Will not waver' -
The US president arrived in Helsinki for a Nordic victory lap after G7 powers vowed to back Ukraine for as long as it takes to beat Russia.
Biden will meet with Finnish President Sauli Niinisto, whose country shares a 1,300 kilometre (800-mile) border with Russia and which ended its historic military non-alignment following Moscow's invasion of Ukraine.
Besides Niinisto and the Finnish Prime Minister Petteri Orpo, Biden will meet Sweden's Ulf Kristersson, Norway's Jonas Gahr Store, Denmark's Mette Frederiksen and Iceland's Katrin Jakobsdottir.
The topic of the discussions is cooperation between the Nordic countries and the United States on security, environmental and technology issues.
Biden will be the first US president to visit Helsinki since Donald Trump's summit five years ago with Russian President Vladimir Putin.
But the trip comes after NATO leaders dashed Ukrainian leader Volodymyr Zelensky's hopes for a clear timeline to join the military alliance, saying they would offer an invite only when "conditions are met".
Instead, G7 nations later offered Ukraine a package of long-term security commitments, involving bilateral deals between Kyiv and the world's richest nations.
"We will not waver," US President Joe Biden said in a speech in Vilnius aimed at showing resolve to Putin after meeting Zelensky at the NATO summit.
"Putin still doubts our staying power. He's still making a bad bet that the conviction and the unity among the United States and our allies and partners will break down."
- 'Complicated' -
Zelensky insisted the promises amounted to a "significant security victory" but did not disguise the fact that he would have preferred a timetable for Ukraine to become its 32nd member after the war is over.
On the sidelines of the NATO summit, Australia pledged to send an additional fleet of 30 armoured Bushmaster infantry vehicles at a cost of $67 million.
But on Thursday, Australia's defence minister cast doubt over a proposal to bolster Ukraine's military with retired fighter jets, saying Kyiv's request for extra air power posed a "complicated question".
In Kyiv, recently-supplied Western weapon systems were insufficient to cover the whole country, the spokesman for Ukraine's air forces Yuriy Ignat said after the overnight strikes.
"We do not have means to destroy ballistic missiles," Ignat told national television on Thursday morning.
Ukraine's air force said it was still seeking information on the "consequences" of an Iskander-M ballistic missile launch by Russia from occupied Crimea.
One dead, at least four wounded in overnight strike on Ukraine's Kyiv
Kyiv, Ukraine (AFP) July 13, 2023 -
Air strikes on Kyiv killed one person and wounded at least four others, authorities said on Thursday, with explosions heard across the Ukrainian capital in the third night of attacks.
Emergency services were responding to calls in Solomyansky, Shevchenkivsky, Podilsky and Darnytsky districts following "explosions in the capital," Kyiv Mayor Vitali Klitschko said.
"In Podilsky district, during the firefighting in an apartment building, a body of one dead person was discovered," Klitschko posted on Telegram.
Two people were wounded in Darnytsky district "as a result of falling debris," Sergiy Popko the head of Kyiv's military administration wrote on Telegram.
Klitschko said two people had been "hospitalised" in Darnytsky district after falling debris damaged a residential building.
It was unclear if they were the same two people.
Two others in Shevchenkivsky district had been treated at the scene, Klitschko said.
Fires broke out in an apartment building in Shevchenkivsky district and in a non-residential building in Podilsky district, he said, adding emergency services were on site.
A picture posted on the official Telegram channel of Kyiv's military administration showed a room in a high-rise building with part of its wall blown out, in what it said was the result of falling debris in Darnytsky district.
The threat of attack by Russian drones on the city remained, Ukraine's Air Force said in a statement.
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