Donald Trump told Vladimir Putin to “stop this ridiculous war” or face a fresh round of tariffs and sanctions.

Putin has said repeatedly that he is prepared to negotiate an end to the war, which first began in 2014, but that Ukraine would have to accept the reality of Russian territorial gains, which are currently about 20% of its land. He also refuses to accept Ukraine joining Nato, the military alliance of Western countries.

Kremlin hard-liners are calling for the dismemberment of Ukraine, while Trump is threatening new sanctions if Putin doesn’t come to the negotiating table.