 NATO chief warns of lines war in Ukraine. NATO Secretary General has warned that Russia's ongoing war in Ukraine might be protracted and has urged Ukraine's Western allies to continue supporting Kiev. We have to understand that President Putin is ready to be in this war for a long time and to launch new offensive. The way to prevent that is to support Ukraine. NATO Secretary General Jens Stoltenberg told AFP on December 16th. Stoltenberg noted that the alliance must remain vigilant over Russia's possible use of nuclear weapons, despite recent decline in Vladimir Putin's nuclear threat rhetoric. The NATO chief also reiterated in his earlier comments that Ukraine must be provided with more weapons until Vladimir Putin understands that he cannot win on the battlefield. He stressed, however, that this war will end at the negotiation temple, as most wars do. Noting that there are discussions about NATO's deliver of patriot systems to Ukraine, Stoltenberg stressed that sufficient amount of ammunition and spare parts are sent to Ukraine. We have a dialogue among allies on additional systems, but it becomes more and more important to ensure that all the systems that are delivered are functional, he explained.