The Syrian Air Force is carrying out both deliberate air strikes against civilians and indiscriminate attacks, a leading rights group has warned.
Human Rights Watch says it visited 52 sites in north-western Syria, documenting 59 such unlawful attacks.
It points out that both types of attacks - estimated to have killed thousands - are serious violations of international law.
It criticises Russia and China for blocking UN action against Damascus.
Between October 2011 and July 2012 they vetoed three proposed UN Security Council resolutions against the Syrian government.
HRW says measures by the UN, such as targeted sanctions, an arms embargo and the referral of the situation to the International Criminal Court, are urgently needed.
It says the Syrian government's unlawful actions are behind many of the 70,000 deaths estimated to have resulted from the conflict.
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