mind_circle_connection+mindmap.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
\usetikzlibrary{mindmap}
\begin{tikzpicture}[outer sep=0pt]
    \node (n1) at (0,0) [circle,minimum size=2cm,fill,draw,thick,red] {};
    \node (n2) at (30:2.5) [circle,minimum size=1cm,fill,draw,thick,blue] {};

    \path (n1) to[circle connection bar switch color=from (red) to (blue)] (n2);
\end{tikzpicture}
	
\end{document}