Islamabad, Sep 3 (IANS): Pakistan Tehrik-i-Insaf (PTI) chairman Imran Khan has lashed out at US President Barack Obama's decision to attack Syria following reports that the government there has used chemical weapons against its own citizens.

“Unilateral military action against a sovereign member state of the UN is against the UN Charter and International Law and the powerful cannot be allowed to break these international norms with impunity,” Khan said in a statement posted on his party's website.

Dubbing Obama's decision to seek the US Congress's approval to strike Syria as an internal issue, Khan said that it was not a source of international legitimisation.

"Even in that context, Secretary of State (John) Kerry's declaration that Congressional approval was not required was a reflection of the militaristic policies displayed by the Obama Administration during its previous and present tenure in office,” he said.

Stating that Pakistan has suffered from this US “cavalier militaristic approach” in the illegal drone attacks against its citizens, Khan said: "It is time respect for international law and the collective security system defined in Chapter VII of the UN Charter was reasserted by the international community.”