The US suspended its compliance with the INF Treaty on 2 February 2019 following an announcement by US Secretary of State Mike Pompeo the day prior. In a statement, Trump said there was a six-month timeline for full withdrawal and INF Treaty termination if the Russian Federation did not come back into compliance within that period. The same day, Putin announced that Russia had also suspended the INF Treaty in a 'mirror response' to Trump's decision to suspend the treaty, effective that day. The next day, Russia started work on new intermediate range (ballistic) hypersonic missiles along with land-based 3M-54 Kalibr systems (both nuclear armed) in response to the US announcing it would start to conduct research and development of weapons prohibited under the treaty.