Russia's war in Ukraine could last for years, NATO Secretary-General Jens Stoltenberg told a German newspaper, adding that the supply of the latest weapons to Ukrainian troops would increase the possibility of liberating the Donbas region. by Russian control.

"We have to prepare for the fact that it may take years.

"We must not relinquish our support for Ukraine," Stoltenberg was quoted as saying by Bild am Sonntag.

"(This should continue) Even if the costs are high, not only for military support, but also because of rising energy and food prices."

A NATO summit in Madrid later this month is expected to conclude an agreement on an aid package for Ukraine that will help the country transition from old Soviet-era armaments to standard NATO equipment, Stoltenberg said early. of this week.

Ukraine vowed on Saturday to "prevail" against Moscow as it fights Russian attacks near a key eastern city, and many countries came under shelling and rocket fire.

Otherwise, Russian forces were defeated in an attempt to attack the Ukrainian capital Kiev in March.

Russia has since relocated to the Donbas region in eastern Ukraine.