Cryptic across

5 Dubious pact he made for a wife of Constantine (6)
7 Japanese city name a famous painter (6)
9 See Officer Commanding, shamefully cashiered, imprisoned (11)
10 Morning run one Russian leader makes in the holy city (8)
12 Sticking point after head of the Italian negotiators errs (4)
13 King of Israel’s kingdom, rightfully protected (4)
15 One’s often in the soup following an earlier drink! (8)
17 The slobbish uncouth Ephraimites could not articulate such peculiarities of speech (11)
19 He was the leader of strike against Russia’s capital with the French in the van (6)
20 This kind of combat gets the chop (6)