kmike

This bird looks to me like one of the smaller  phylloscopus warblers.

The dark markings on the throat and chin look rather odd, but the pale bill with a dark tip suggests that this a a Yellow-browed Warbler with some unusually dark feathering.
There is one phylloscopus warbler with a dark throat - Ashy-throated Warbler. However that species has a yellow belly.

Cheers
Mike K