Since last week, after Russia increased its attack on Ukraine, not only the initiative of the United States to negotiate for a cease-fire is being interrupted, but the relationship between the two superpowers is growing cold. US President Donald Trump is increasing pressure on Russia, saying that he will impose new tariffs if there is no ceasefire. In this context, Trump's special envoy Steve Witkoff will visit Moscow on Sunday to create an environment for peace talks with Ukraine, according to Matthew Whittaker, the US ambassador to NATO.

"Hopefully, Witkoff will be able to achieve the objective for which he is visiting Moscow," Whittaker said. Special Envoy Wittkoff has previously met with Russian President Vladimir Putin several times during his diplomatic efforts. Although Trump informed about the plans of Wittkoff's visit to Russia, he did not give information about when and at what time.

Similarly, Whitaker also said that the US wants to sell weapons to NATO allies. NATO allies will then provide those weapons to Ukraine to facilitate talks between Moscow and Kiev, it said. "I hope that the United States will sell our weapons to NATO allies, which will force the Russians to come to the negotiating table and create an environment for a ceasefire," he said. Earlier this week, US President Trump issued a 10-day ultimatum to Russia and Ukraine, which are at war, and warned that if Russia does not come within that period, it will increase tariffs on a large scale and impose many penalties. It is said that 100 percent tax and sanctions may be imposed on Russia's trade partner countries.