NATO and Ukraine will hold emergency talks Tuesday after Russia attacked a central city with an experimental, hypersonic ballistic missile that escalated the nearly 33-month-old war. Related video above: Vladimir Putin praises the new Oreshnik missile used against Ukraine The conflict is "entering a decisive phase" and "taking on very dramatic dimensions,

The Kremlin has been clear that it views the supply of Western weapons to Ukraine as a hostile act, with Putin warning of a potential retaliation.