Ukraine’s parliament has canceled a session as security was tightened after Russia deployed a new ballistic missile that threatens to escalate the nearly three-year war.

By launching a new nuclear-capable intermediate-range ballistic missile at Ukraine on Thursday, Russia was threatening Kyiv and its Western allies with the aim of stopping Ukrainian strikes with Western-supplied weapons on Russian territory — or else.

The Russian president says the strike was in response to Ukraine's "use of American and British long-range weaponry".