Russia is open to peace with Ukraine but achieving its goals remains a priority, Kremlin spokesman Dmitry Peskov said Sunday, days after U.S. President Donald Trump gave Moscow a 50-day deadline to agree to a ceasefire or face tougher sanctions.

U.S. President Donald Trump's decision to ramp up arms shipments to Ukraine is a signal to Kyiv to abandon peace efforts, Russia said on Thursday, vowing it would not accept the "blackmail" of Washington's new sanctions ultimatum.

President Trump reportedly questioned Ukrainian President Volodymyr Zelensky about whether Kyiv could blast Moscow and St Petersburg, but later indicated publicly that Russia’s capital should be off limits.