Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of ambassadors of Russia to the United States
Table title:
Ambassadors of the Russian Empire to the United States of America
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Photo </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Date from </th><th colspan=1 rowspan=1 > Date until </th></tr>
<tr> <td colspan=1 rowspan=1 > Andrey Yakovlevich Dashkov </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1808 </td><td colspan=1 rowspan=1 > 1817 </td></tr>
<tr> <td colspan=1 rowspan=1 > Pyotr Ivanovich Poletika </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1817 </td><td colspan=1 rowspan=1 > 1822 </td></tr>
<tr> <td colspan=1 rowspan=1 > Fyodor van Tuyll van Serooskerken </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1822 </td><td colspan=1 rowspan=1 > 1826 </td></tr>
<tr> <td colspan=1 rowspan=1 > Pavel Kridener </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1827 </td><td colspan=1 rowspan=1 > 1837 </td></tr>
<tr> <td colspan=1 rowspan=1 > Alexander Bodisko </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1837 </td><td colspan=1 rowspan=1 > 1854 </td></tr>
<tr> <td colspan=1 rowspan=1 > Alexander Medem </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1854 </td><td colspan=1 rowspan=1 > 1855 </td></tr>
<tr> <td colspan=1 rowspan=1 > Eduard de Stoeckl </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1855 </td><td colspan=1 rowspan=1 > 1869 </td></tr>
<tr> <td colspan=1 rowspan=1 > Konstantin Katakazi </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1869 </td><td colspan=1 rowspan=1 > 1872 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Karl von Struve </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > 1882 </td><td colspan=1 rowspan=1 > 1892 </td></tr>
<tr> <td colspan=1 rowspan=1 > Count Arthur Paul Nicholas Cassini </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1898 </td><td colspan=1 rowspan=1 > 1905 </td></tr>
<tr> <td colspan=1 rowspan=1 > Roman Rosen </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1905 </td><td colspan=1 rowspan=1 > 1911 </td></tr>
<tr> <td colspan=1 rowspan=1 > George Bakhmetev </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 1911 </td><td colspan=1 rowspan=1 > 1917 </td></tr>
</table>
Question:
What ambassador role did Karl von Struve serve?
Answer:
In 1882, Struve was posted as Minister to the United States.