German Chancellor Olaf Scholz is resisting a possible Western expansion in military backing for Ukraine, saying on Sunday he does not favour allowing Kiev to use German weapons to hit targets in Russia. “We have clear rules agreed with Ukraine for the arms deliveries we have made so far. And they work. At least that’s my theory,” Scholz said at a Berlin event marking the 75th anniversary of Germany’s constitution, or Basic Law. Germany has supplied Kiev with long-range artillery pieces such as the Mars II rocket launcher, which has a range of more than 80 kilometres, since Russia invaded Ukrai…