Japan on Friday unveiled its biggest military build-up since World War Two with a $320 billion plan that will buy missiles capable of striking China and ready it for sustained conflict, as regional tensions and Russia's Ukraine invasion stoke war fears.

Russia relaunches missile attacks on Ukraine as the West tried to limit Moscow's ability to finance its invasion by imposing a price cap on Russian seaborne oil.

The administration of US President Joe Biden is contemplating a drastic expansion of the training program for Ukrainian forces, which is expected to take place at a US military base in Germany, CNN reported on Wednesday, citing sources.

The US Army has announced that a $1.2 billion contract to produce six National Advanced Surface-to-Air Missile Systems (NASAMS) for Ukraine, amid its conflict with Russia, has been awarded to the defense conglomerate Raytheon.

The United States government is mulling over whether to provide Patriot missiles to Ukraine’s armed forces, the Defense Department said, weeks after Kiev explicitly requested the pricey weapon system.

The Pentagon is considering a Boeing proposal to supply Ukraine with cheap, small precision bombs fitted onto abundantly available rockets, allowing Kyiv to strike far behind Russian lines as the West struggles to meet demand for more arms.

Washington’s policy of continuously arming Ukraine is exacerbating delays of weapon shipments to Taiwan, the Wall Street Journal reported on Sunday, citing congressional and government officials familiar with the matter.

Ukrainian authorities on Friday gradually restored power, aided by the reconnection of the country's four nuclear plants, but millions of people were still in the dark after the most devastating Russian air strikes of the war.

Eastern Europe's arms industry is churning out guns, artillery shells and other military supplies at a pace not seen since the Cold War as governments in the region lead efforts to aid Ukraine in its fight against Russia.

The US is starting to worry about the lack of state-of-the-art systems and ammunition it is sending to Ukraine amid the conflict with Russia, CNN reported on Thursday, citing sources.

Russian attacks Ukrainian positions with missiles and shells in several regions and there was no let up in heavy fighting in Donetsk in the east, the Ukrainian military said on Thursday night as Moscow's occupying forces appeared more active.

Ukrainian President Volodymyr Zelensky declared Kherson "ours" after Russia withdrew troops from the city, which the US hailed Saturday as an "extraordinary victory".