The United States has called off the Budapest summit between President Trump and President Putin due to Russia's uncompromising demands over Ukraine. This move highlights the growing impasse in efforts to negotiate an end to the conflict.

Russian President Vladimir Putin claimed Wednesday that Russian troops have surrounded Ukrainian forces in two key eastern cities of Ukraine and offered to negotiate a deal for their surrender.

Russian forces are close to taking the eastern Ukrainian city of Pokrovsk after a pincer movement almost totally encircled it while small groups of highly mobile Russian units penetrated the city, acc...