Updated

The Russian president's foreign policy advisor says Russia has not seen the U.S. intelligence that Washington claims proves the role of the Syrian government in last week's alleged chemical weapons attack.

The Obama administration shared intelligence with U.S. lawmakers on Thursday aimed at convincing them the Syrian government used chemical weapons against its people in the Aug. 21 attack and must be punished. Vladimir Putin's aide Yuri Ushakov told reporters on Friday he cannot comment on the intelligence because the U.S. has not shared it with Russia.

Russia has insisted there is no evidence the government is behind the attack. Russia and China have said that they would block any U.N. resolution that authorizes force, but the U.S. has signaled it would act even without its backing.