KIEV, May 19 – Oleksandr Turchynov, speaker of the Ukrainian parliament and acting president of Ukraine, said he is confident Ukraine will cope with possible difficulties if Russia stops supplying gas on June 1.

"According to international rules, if a case is tried in international arbitration, one party cannot unilaterally stop supplying goods and terminate a contract that is being contested," Turchynov said on 1+1 television on Sunday, recalling that Ukraine has filed a lawsuit against Russia with international arbitration.