BBC news July 8 counter-offensive by Ukrainian troops

The counter-offensive by Ukrainian troops against Russia, now entering its second month, has been met with fierce resistance - as well as criticism from within Ukraine that not enough progress is being made.

It has been an extremely costly operation, but many experts say that the country needs more time to prepare for a strategic breakthrough.

Some soldiers and observers are starting to wonder if a breakthrough is possible, or whether Russia's defensive lines, built up and heavily-reinforced over the winter months, are simply too much of a barrier.

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