Yandex.Direct is concerned with the security of ads placed on its service. Therefore, a multistage technology, which combines both automatic and manual filtration methods, is used to protect against unfair and erroneous clicks.
Clicks which are identified by Direct as invalid are not counted in Direct's statistical reports and funds are not debited from the advertiser's account for them.
Often an increase in the number of ad clicks can be caused by other factors. The most frequent reasons for spikes in activity are described in the section I noticed a spike (or a dip) in impressions (or clicks or expenditures).