Russian President Vladimir Putin has challenged the United States’ claim of possessing proof of Russian intervention in Ukraine.

During an interview with Radio Europe 1 news and TF1 TV channel, Mr. Putin was asked about claims by the U.S. that they had proof of Russian intervention in Ukraine. President Putin’s response was: “Proof? Why don’t they show it?”

He went on to discredit the the alleged proof by recalling the United States’ claim of evidence of weapons of mass destruction (WMDs) in Iraq, only to find out after U.S. troops invaded Iraq and Saddam Hussein was hung that there was, in fact, no WMDs.

“The entire world remembers the U.S. Secretary of State demonstrating the evidence of Iraq’s weapons of mass destruction, waving around some test tube with washing powder in the U.N. Security Council,” Mr. Putin said. “You know, it’s one thing to say things and another to actually have evidence,” he added.

The Ukrainian Government and Western leaders have repeatedly accused Russia of supporting the pro-Russian separatists in Eastern Ukraine that are fighting for independence, a claim which Moscow denies.

When asked about Russian troops annexing Crimea in March, Mr. Putin clarified the soldiers’ roles, saying that they didn’t annex the region.

“It’s a delusion that Russian troops annexed Crimea,” he said. “Russian troops were in Crimea under the international treaty on the deployment of the Russian military bases. It’s true that Russian troops helped Crimeans hold a referendum on their (a) independence and (b) desire to join the Russian Federation. No one can prevent these people from exercising a right that is stipulated in Article 1 of the U.N. Charter, the right of nations to self-determination.”

The contents of Article 1 of the U.N. Charter:

The Purposes of the United Nations are:

To maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace; To develop friendly relations among nations based on respect for the principle of equal rights and self-determination of peoples, and to take other appropriate measures to strengthen universal peace; To achieve international co-operation in solving international problems of an economic, social, cultural, or humanitarian character, and in promoting and encouraging respect for human rights and for fundamental freedoms for all without distinction as to race, sex, language, or religion; and To be a centre for harmonizing the actions of nations in the attainment of these common ends.

Mr. Putin has repeatedly stressed that Ukrainian citizens have “certain rights, political, humanitarian rights, and they must have a chance to exercise those rights.”

NATO and Kiev have refused to recognize the annexation as legitimate and have stressed that Crimea is still part of Ukraine. NATO Secretary General Anders Fogh Rasmussen said on Wednesday that “NATO allies do not, and will not, recognize Russia’s illegal annexation of Crimea.”

When asked if Russia will return Crimea to Ukraine, Mr. Putin said that “In accordance with the expression of the will of people who live there, Crimea is part of the Russian Federation and its constituent entity.”

President Putin stated that with the possibility of Ukraine joining NATO, Moscow “could not allow a historical part of the Russian territory with a predominantly ethnic Russian population to be incorporated into an international military alliance, especially because Crimeans wanted to be part of Russia. I’m sorry, but we couldn’t act differently.”

Following the annexation, pro-Russian activists in eastern and southern Ukraine took up arms against the Kiev authorities, leading to clashes with the Ukrainian military that have resulted in scores of deaths in recent months. The Ukrainian government has accused Moscow of supporting and supplying the separatists, a claim which the Kremlin denies.

Mr. Putin and other top ranking Russian officials have criticized Ukraine for allegedly attacking its own citizens and denying its people their rights.

It is “vital” to hold talks with the separatists “instead of sending tanks” to deal with them and “firing missiles at civilians from the air and bombing non-military targets,” the president said, adding that the Kiev authorities must hold talks with the militants to deescalate the crisis.

Fighting in recent weeks has resulted in dozens of deaths. Clashes between the Ukrainian military and armed separatists at the Donetsk International Airport last week left over 50 militants dead, separatists leader said. On Monday, an estimated 500 separatists began a three-day attack on a border center near the city of Luhansk. Today, the guards left the center. Also on Monday, a Ukrainian fighter jet bombed Luhansk’s main regional building, resulting in the deaths and injuries of several citizens.

Russia has demanded that Kiev bring an immediate end to its military operations against the separatists, and expressed its will to work with the Ukrainian government to deescalate the crisis.

In response to Westerners’ claims of Russia wishing to restore the Soviet Union and destroy Ukraine, Mr. Putin said that Moscow recognizes Ukraine as sovereign state and respects the country’s choices, but wishes that it would not join NATO because it would mean “NATO’s infrastructure will move directly towards the Russian border, which cannot leave us indifferent.”

President Putin also responded to accusation against the Kremlin by U.S. Senator Hillary Clinton that Russia’s recent actions resembles Hitler’s during the 1930’s: “when I hear such extreme statements, to me it only means that they don’t have any valid arguments.”

He also said that the U.S. takes the “most aggressive and toughest policy to defend their own interests… and they do it persistently.”

Mr. Putin concluded his statement by scoffing the United States’ disapproval of Russia’s recent “aggressive” actions, saying: “There are basically no Russian troops abroad while U.S. troops are everywhere. There are U.S. military bases everywhere around the world and they are always involved in the fate of other countries even though they are thousands of kilometers away from U.S. borders.”