Ukraine’s capital Kyiv came under Russian drone attack on Monday morning, the country’s military administration said on Telegram.
Officials said on the social media platform that nine Iranian-made Shahed drones were shot down in the city's airspace with an alert continuing.
The administration said: “The enemy is attacking the capital with Shahed barrage ammunition. Air defence is being at work.”
Witnesses told Reuters news agency that several loud blasts were heard in Kyiv and the region that surrounds the Ukrainian capital.
Oleksiy Kuleba, the Governor of Kyiv, confirmed the news on Telegram after air raid warnings were heard in the city and parts of eastern Ukraine.
Russia invaded Ukraine on February 24. The total death toll for both sides is disputed but it is thought around 13,000 Ukraine soldiers have died and around 10,000 Russians servicemen also have.
On Monday it was also announced that Russia and China will hold joint naval drills between December 21-27.
The joint naval exercises, which have taken place annually since 2012, will involve missile and artillery firing in the East China Sea, Russia's defence ministry said.
"The main purpose of the exercises is to strengthen naval cooperation between Russia and China, and maintain peace and stability in the Asia-Pacific region."
Since Russia invaded Ukraine in February, Moscow has sought to increase its political, security and economic links with Beijing and sees China's leader Xi Jinping as a key ally in an anti-West alliance.
The two countries signed a "no limits" strategic partnership just days before Moscow launched the biggest land invasion in Europe since the Second World War in February, but Beijing has since expressed concerns over Russia's actions in Ukraine.
Russia said four of its vessels would take part in the drills - including the Varyag missile cruiser - while six Chinese vessels would take part, along with aircraft and helicopters from both sides.
Russian ships set sail on Monday from the Far Eastern port of Vladivostok to take part in the week-long exercises, which start on Wednesday.
