BRUSSELS (Reuters) - NATO is ready to support Ukraine for years in the war against Russia, including helping Kyiv to advance from old Soviet-era weapons to modern Western military equipment, the alliance's Secretary-General Jens Stoltenberg said on Thursday.

       "We need to be prepared for the long term...There is absolutely the possibility that this war will drag on and last for months and years," Stoltenberg told a youth summit in Brussels, adding that NATO allies were preparing to help Ukraine to move on to NATO-standard weapons.

       (Reporting by Sabine Siebold, editing by Marine Strauss)