REUTERS

"The meetings of all the four ad hoc subgroups will begin next Tuesday, June 2, and I'm sure that progress could be achieved there, and the progress will be achieved if the activity of these groups isn't called in question," Steinmeier said at a joint press conference with his Ukrainian counterpart Pavlo Klimkin, an UNIAN correspondent reported.

"And the truce needs to be observed to ensure their [the groups'] work," he stressed.