President Donald Trump has called on Russian president Vladimir Putin to negotiate an end to the nearly three-year-old war Russia launched against Ukraine, and is threatening to impose further sanctions on Moscow if the Russian leader does not acquiesce.

US President Donald Trump has threatened to impose stiff taxes, tariffs and sanctions on Russia if an agreement is not reached to end the war in Ukraine. The US already prohibits the import of virtually all Russian products, and Russia has faced a multitude of US and European sanctions since the invasion began almost three years ago.