Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: European missile defense
 Argument: A European missile defense system threatens and antagonizes Russia.
against

Topic: Republika Srpska secession from Bosnia and Herzegovina
 Argument: Serb Republic secession could spark regional war.
against

Topic: Mandatory military service
 Argument: National service promotes patriotism.

in favor