0458 GMT November 19, 2019
The White House said in a statement that Obama issued the warning in a phone call with Putin on Tuesday, Press TV reported.
"If Russia continues its aggressive actions in Ukraine, including by sending troops, weapons and financing to support the separatists, the costs for Russia will rise," Obama told Putin.
Obama underscored “the rising human toll of the fighting and underscored the importance of President Putin seizing the opportunity presented by the ongoing discussions between Russia, France, Germany, and Ukraine to reach a peaceful resolution," the statement read.
This is while the Russian president is expected to meet with the leaders of France, Germany and Ukraine at a summit in Belarus on Wednesday to discuss a multilateral solution to the ongoing crisis.
The US media reported last week that the Obama administration is considering supplying the Ukrainian military with weapons and equipment to fight pro-Russian forces.
European leaders believe sending in weapons would only escalate a conflict that has claimed 5,400 lives in less than a year.
Russia has warned the US against sending weapons to Ukraine, saying the move would cause “colossal damage” to ties between the two countries.