In a video message, NATO Secretary General Jens Stoltenberg said Ukraine was on track to join the alliance, but he also described news of Russia's advances as “extremely dangerous.”
“As we prepare you for that day, NATO will continue to stand with Ukraine,” he added.
Boris Johnson visited Kiev on Saturday to meet Volodymyr Zelensky.
The former Prime Minister renewed his call for Ukraine's allies to send more weapons to it.
He added: “They need artillery and long-range artillery shells of all kinds.” It is ridiculous to say that giving them weapons is provocative or escalatory.”
He added that Russian forces were “firing ten times more shells in some places.”
“How can we look these soldiers in the eyes and say we are doing enough?”
Last week, Russian soldiers announced the Kremlin's first battlefield victory since last May, by seizing the town of Avdiivka, although analysts described this as a pyrrhic victory because 17,000 Russian soldiers were killed while seizing the town. Destroyer.
In an unusually pessimistic assessment of the battlefield, the British Ministry of Defense said that the Kremlin had suffered heavy losses but was now able to replenish its army.
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“The number of Russian forces in Ukraine is now greater than at the beginning of the war. They are now able to continue attacks along the front line and follow a strategy of attrition.
While Europe has struggled to increase its arms production and US domestic politics have slowed the flow of weapons from Washington, Russia has boosted its munitions production and struck deals with North Korea and Iran that have swelled its weapons depots, analysts said.
In capitals across Europe, thousands of people demonstrated against Russian aggression.