The Ukrainian stock market is gradually resuming operations after key institutions of the depository and clearing system - the National Depository of Ukraine (NDU) and Clearing Center for Servicing Agreements on the Financial Markets, both based in Kyiv - were affected by a huge cyber attack on June 27.

"After forced cancelation of trading on June 29, 2017 over failures in operation of the clearing infrastructure of the Ukrainian stock market we can report the resumption of trading on June 30, 2017 on the quotation and repo markets to allow traders to have a chance of signing contracts on the delayed execution conditions," the PFTS stock exchange reported.

The exchange said that the signing of contracts with the settlement date June 30, 2017 is possible only after the full restoration of operations of the clearing infrastructure of the Ukrainian stock market.

One of the market players told Interfax that some banks and funds that are actively trading with government bonds asked to resume the trading to balance the month and the six-month period.

Ukrainian Exchange, which was not affected by the cyber attack as PFTS, is servicing trading only on the forward market, apart from futures and option contracts for the Ukrainian shares index, trading with which will be resumed synchronously with the restoration of trading on the stock market.

"The clearing center promised to allow trading in the usual mode in a couple of hours," Ukrainian Exchange Board Chairman Oleh Tkachenko said.

Perspectiva stock exchange affected by the virus also resumed operations on Friday.

The NDU said on its website that the client cabinet service has been resumed. The NDU warned that the speed of exchanging the information will depend on the loading of the network and could be slow.