WASHINGTON — Former UN Secretary General Kofi Annan is warning that military intervention in Syria by the major powers won’t work.

In comments to be aired Sunday on CNN’s “Fareed Zakaria GPS,” Annan says the situation in Syria is more complex than in Libya, and that military intervention could make things worse.

Annan was the UN and Arab League’s special envoy to Syria until August, when he resigned after his peace plan failed. That led Republican Paul Ryan to say in the vice presidential debate that the US should not have waited for Annan to develop an agreement and that the delay had bought Syrian President Bashar Assad more time.

Annan says Ryan is, quote, “dead wrong.” He says raising the hopes of the Syrian people while other countries are still reluctant to intervene complicates the situation.

On Saturday, the Turkish foreign minister declared that a voluntary transfer of power in Syria was no longer possible.

Ahmet Davutoglu told reporters in Sanaa, Yemen that a power-transfer deal, like that which allowed longtime Yemeni president Ali Abdullah Saleh to step down, was no longer a suitable model for Syria.

“The Yemen solution was suitable for Syria nine months ago,” Davutoglu said, according to Reuters. “But now, because every country has its own special circumstances and due to the latest developments on the Syrian arena which saw the use of artillery and the air force in bombarding Syrian cities, this has narrowed the room for implementing such solutions.”

Anti-regime activists say more than 33,000 people have been killed in 19 months of violence in Syria.