closed cities
... that up to 2 million people may be living in Russian closed cities, which are off-limits to foreigners because they have sensitive military and nuclear industry?
... that up to 2 million people may be living in <a href="./Russia" id="mwAVg" rel="mw:WikiLink" title="Russia">Russian</a> <b id="mwAVk"><a href="./Closed_city" id="mwAVo" rel="mw:WikiLink" title="Closed city">closed cities</a></b>, which are off-limits to foreigners because they have sensitive <a href="./Military" id="mwAVs" rel="mw:WikiLink" title="Military">military</a> and <a class="mw-disambig" href="./Nuclear" id="mwAVw" rel="mw:WikiLink" title="Nuclear">nuclear</a> <a class="mw-disambig" href="./Industry" id="mwAV0" rel="mw:WikiLink" title="Industry">industry</a>?