The European Union executive holds only limited leverage to stop ruling nationalists eroding the rule of law in Poland.
Separatists in eastern Ukraine on Tuesday proclaimed a new state that aspires to include not only the areas they control but also the rest of the country.
President Donald Trump is headed back to Europe hoping to receive a friendly welcome in Poland despite lingering skepticism across the continent.
President Donald Trump is breaking with tradition by visiting Poland, an ex-communist country in central Europe, before making a presidential visit to longtime allies Britain, France or Germany.
Moscow has only once before suspended the hotline, which was established in October 2015 to prevent conflict between the different forces operating in Syrian airspace.
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