The inconsistent policy of Ivan Shishman has been described as revealing his weakness and inability to cope with the situation .
There are no direct historical sources to suggest any significant attempts by Ivan Shishman to fight off the Turks .
The inconsistent policy of Ivan Shishman has been described as revealing Ivan Shishman 's weakness and inability to cope with the situation .
There are no direct historical sources to suggest any significant attempts by Ivan Shishman to fight off the Turks .