President of Ukraine Petro Poroshenko has thanked the U.S. leaders for expanding sanctions against legal entities and individuals of Russia for violating the sovereignty and territorial integrity of Ukraine.

"I welcome the widening by Washington of sanctions against Russia's legal and physical entities for violation of the sovereignty and territorial integrity of Ukraine in Crimea and Donbas!" he wrote on Facebook on Thursday evening.

Poroshenko noted that the imposed sanctions are a clear signal of international support for Ukraine.

"This is a clear message that all those involved in the illegal occupation of the Ukrainian peninsula and hybrid aggression in Donbas will not avoid responsibility. I deem that all our partners should follow this example," Poroshenko noted.

The president of Ukraine called on the world community for unity on the issue of sanctions pressure on Russia.

"It is by means of our common transatlantic front that one will be able to make the Kremlin change its behavior, bring its mercenaries out from Ukraine, return the stolen territories and respect the international law!" the president said.