The Russian invasion is set to last for around four more months, Ukraine's ministry of defence claims.
Vladimir Putin 's "special military operation" is likely to end in September, according to alleged information said to have been leaked from within his own army.
A statement from the ministry's main intelligence directorate, released on Tuesday, also said the "occupiers" of port city Mariupol today are carrying out "big cleaning" in which they are burning dead bodies in three mobile crematoria.
