Triangles $RST$ and $UVW$ are shown. The relationship between their side lengths is given by $\frac{RS}{UV}=\frac{ST}{VW}=\frac{TR}{WU}=\frac{1}{2}$. If the measure of angle $RST$ is $70^{\circ }$, what is the measure, in degrees, of angle $UVW$? (Disregard the degree symbol when gridding your answer.)