Russia unleashed its latest overnight drone strike on Ukraine, targeting the capital Kyiv in an attack that lasted into midday and wounded at least one person, city officials said on Saturday.

Debris from downed drones struck six city districts, wounding a police officer, damaging residential buildings and starting fires, according to city military administrator Serhiy Popko, Reuters reported.

"Another night. Another air-raid alert. Another drone attack. The armed forces of the Russian Federation attacked Kyiv again according to their old and familiar tactics," Popko wrote on social media.

All the drones aimed at Kyiv had been shot down, he said.

Ukrainian energy provider DTEK said a high-voltage line powering the capital and two distribution networks in the Kyiv region had been damaged.

DTEK said in a statement that electricity had mostly been restored and that repairs were underway.

Reuters correspondents reported hearing explosions in and around the city during an air-raid alert that lasted more than five hours. One drone was seen flying low over the city amid the din of automatic-weapons fire.

Ukraine's military reported on Saturday that air defences had destroyed 39 out of 71 Russian drones that had been launched, and that another 21 had been "locationally lost".

President Volodymyr Zelenskiy said strikes were also reported in the central Poltava and northeastern Sumy and Kharkiv regions, read the report.

"This year, we have faced the threat of 'Shahed' drones almost every night — sometimes in the morning, and even during the day," he wrote on social media, referring to the Iranian-made attack drones used by Russia.

Russian forces have carried out regular airstrikes on Ukrainian towns and cities behind the front lines of the war which began when Russia invaded its neighbour in February 2022.

Kyiv's military said on Friday that Moscow's forces had launched more than 2,000 drones at civilian and military targets across Ukraine in October alone.

Russia has denied aiming at civilians and said power facilities are legitimate targets when they are part of Ukrainian military infrastructure.

Nineteen people in central Israel's Sharon region were injured, the Israeli police said, after the military reported the launch of three projectiles from Lebanon into Israeli territory early on Saturday.

The national ambulance service previously reported that seven people in the central Israeli town of Tira were injured, Reuters reported.

The Israeli military said that sirens sounded in several areas of central Israel after the projectile launch. Some projectiles had been intercepted, it said.

"A fallen projectile was most likely identified in the area," the army added, noting that details were under investigation.

The national ambulance service and local media said the injuries in Tira ranged from mild to moderate, while two other people suffered stress symptoms.

The Islamic Resistance in Iraq said later in a statement it had launched drones at a "vital target" in northern Israel. It was not immediately clear if the group's action was related to the injuries.

Fighting in Lebanon has escalated dramatically in recent weeks between Israeli forces and the Lebanese Hezbollah group.

Russia test-fired missiles over distances of thousands of miles on Tuesday to simulate a "massive" nuclear response to an enemy first strike, Reuters reported.

"Given the growing geopolitical tensions and the emergence of new external threats and risks, it is important to have modern and constantly ready-to-use strategic forces," President Vladimir Putin said as he announced the exercise.

It took place at a critical moment in the Russia-Ukraine war, after weeks of Russian signals to the West that Moscow will respond if the United States and its allies allow Kyiv to fire longer-range missiles deep into Russia.

On Monday NATO said that North Korea has sent troops to western Russia, something Moscow has not denied.

In televised comments, Defence Minister Andrei Belousov told Putin that the purpose of the drill was to practice delivering "a massive nuclear strike by strategic offensive forces in response to a nuclear strike by the enemy".

The exercise involved Russia's full nuclear "triad" of ground-, sea- and air-launched missiles.

A Yars intercontinental ballistic missile was launched from Plesetsk cosmodrome in northwest Russia to Kamchatka, a peninsula in the far east.

Sineva and Bulava ballistic missiles were fired from submarines, and cruise missiles were launched from strategic bomber planes, the defence ministry said.

The 2-1/2-year-old war is entering what Russian officials say is its most dangerous phase as the West considers how to shore up Ukraine while Russian forces advance in the east of the country.

Putin said using nuclear weapons would be an "extremely exceptional measure".

"I stress that we are not going to get involved in a new arms race, but we will maintain nuclear forces at the level of necessary sufficiency," he said.

He added that Russia was moving to new "stationary and mobile-based missile systems" which have a reduced launch preparation time and could overcome missile defence systems.

The drill follows an Oct. 18 exercise in the Tver region, northwest of Moscow, involving field movements by a unit equipped with Yars intercontinental ballistic missiles, capable of striking U.S. cities, Reuters reported.

Nuclear Signals

Since the start of the war, Putin has sent a series of pointed signals to the West, including by changing Russia's position on major nuclear treaties and announcing the deployment of tactical nuclear missiles to neighbouring Belarus.

Ukraine has accused him of nuclear blackmail. NATO says it will not be intimidated by Russian threats.

Last month the Kremlin leader approved changes to the official nuclear doctrine, extending the list of scenarios under which Moscow would consider using such weapons.

Under the changes, Russia would consider any assault on it supported by a nuclear power to be a joint attack - a warning to the United States not to help Ukraine strike deep into Russia with conventional weapons.

Putin has said that Russia does not need to resort to the use of nuclear weapons in order to achieve victory in Ukraine.

Russia is the world's largest nuclear power. Together, Russia and the U.S. control 88% of the world's nuclear warheads.

U.S. officials say they have seen no change to Russia's nuclear deployment posture during the war.

But the United States in 2022 was so concerned about the possible use of tactical nuclear weapons by Russia that it warned Putin over the consequences of using such weapons, according to Central Intelligence Agency Director Bill Burns.