The report also said that targeted strikes sometimes cause civilian deaths, which could alienate the local population and bolster militant sentiments.
Around 2,000 members of the Afghan Ulema Council were meeting in Kabul when a lone bomber struck.
The Afghan government is offering to make the Taliban a political party.
The Air Force admitted the tweet was "in poor taste."
The longest-serving commander in the longest war in U.S. history said he would welcome Moscow's help.
Insurgents such as the Taliban and ISIS exert more control or influence than ever previously recorded by a Congress-mandated watchdog.
At least 25 people were killed by two bombs close to the headquarters of the Afghan intelligence services.
Fighters seemed to struggle with the leapfrogging exercises in particular.
Since 2001, the U.S. has been involved in several ongoing overseas conflicts with no clear end in sight.
“Don’t worry, those are people that are tied to me...They are Taliban."
Photos distributed on Wednesday show two small children participating in the execution of two Afghan soldiers and an accused spy in eastern Afghanistan.
The extremist leader has been linked to a plot to attack Times Square in New York City.
Russia's deputy foreign minister said Yugoslavia, Iraq, Libya and Ukraine were among the global victims of U.S. foreign policy.
These countries have scored the lowest in terms of economy, environment, personal freedom, security, welfare and well-being.
Insurgents for the group overran three checkpoints in night raids on Tuesday.
But the total number of civilian casualties actually decreased in 2017, the U.N. said.
The demand comes after two major Taliban attacks in Kabul that left 150 civilians dead.
Trump’s figures have been disputed.
Former Defense Secretary Chuck Hagel said the U.S. military “can’t fix the problems in Afghanistan” and Russia “really holds the cards” in Syria.
For the first time ever, the Pentagon blocked the release of territorial control data in the Afghanistan conflict, but a BBC study painted a grim picture.
The Pentagon told an independent watchdog not to publish numbers on insurgent control of Afghanistan, despite the fact that the data is unclassified.
Nasir Mahmood was killed in the lawless border region between Afghanistan and Pakistan.