Ukrainian President Volodymyr Zelenskyy has warned that Russia may be preparing to launch a “massive” new attack against Ukraine.”We have intel indicating that Russia is preparing a new massive attack,” Zelenskyy said in a post on social media late on Friday, while also advising people to listen out for air raid alerts and keep safe.”The air force and protectors of our skies will be working around the clock, as always,” he added.It comes after Russia deployed its nuclear-capable Oreshnik missile in a wave of strikes on the Kyiv region last weekend. Ukraine said the attack included 90 missiles and 600 drones.The use of the Oreshnik, an intermediate-range ballistic missile that Russia first used in a strike on Dnipro in 2024, drew strong criticism from leaders across Europe.On Friday, Zelenskyy also reiterated his call for more Patriot missile systems from the US. The Patriot is an air and missile defense system used to intercept ballistic missiles, cruise missiles, drones, and aircraft.Zelenskyy told reporters in Sweden on Thursday that he was being “very persistent” in his pursuit of new missiles for the system. He reportedly wrote to US President Donald Trump earlier this week asking for more ammunition.“For us — for a nation fighting for its survival — there is hardly anything more painful to see than Patriot batteries with no missiles loaded,” he said in his letter to Trump.