DONETSK REGION, Ukraine — Days before the leaders of Russia and the U.S. hold a summit meeting in Alaska, Moscow's forces breached Ukrainian lines in a series of infiltrations in the country's industrial heartland of Donetsk.

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Days before the leaders of Russia and the U.S. hold a summit meeting in Alaska, Moscow's forces breached Ukrainian lines in a series of infiltrations this week in the country's industrial heartland of Donetsk

The advances amounted to only a limited success for Russia, since Moscow still needs to consolidate its gains before achieving a true breakthrough

Still, some observers said it's a potentially dangerous moment

Analyst Mykola Bieleskov said Russian President Vladimir Putin will likely try to persuade U.S. President Donald Trump to pressu

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