NATO Secretary General Jens Stoltenberg warned that the Western military alliance should also be prepared for bad news from the Ukrainian front, without specifying the details.
"Wars take place in stages. We have to support Ukraine in good times and bad. We should also be prepared for bad news," Stoltenberg told Germany's ARD as Western allies debate military and financial aid to Ukraine and Moscow increases number of soldiers.
Russian President Vladimir Putin signed a decree on Friday increasing the number of soldiers by about 170.000, to 1,3 million. The front lines have been almost unchanged in recent months, despite Ukraine's counter-offensive over the summer.
During the counter-offensive, the Ukrainians used cruise missiles to suppress the Russian fleet in the Black Sea and caused damage to Russia deep in its territory, which Stoltenberg assessed as "great victories even though they failed to move the front line", the Brussels portal Politiko reports.
Stoltenberg called on NATO members to increase ammunition production and expressed regret for the state of the European defense industry.
"We are not able to cooperate as closely as we should," Stoltenberg said, urging governments to look beyond their national interests.
He said that Putin's victory would not only be a tragedy for Ukraine, but also a danger for other allies.