President Vladimir Putin said Friday that Russia will continue to test and start mass-producing the hypersonic ballistic missile that it fired at Ukraine Thursday.

Vladimir Putin test-fired the “Oreshnik”, the Russian word for hazelnut tree, for the first time in combat on Thursday against the Ukrainian city of Dnipro. He later boasted that it had been designed for a “decisive” strike on Britain – and added a chilling warning.

Moscow will continue using a powerful new missile in its war against Ukraine, Russian President Vladimir Putin said amid a major escalation in the conflict. Putin’s remarks late Friday came after the Russian military fired a new ballistic missile at the Ukrainian city of Dnipro on Thursday.