So what we see here is a left wing of hawks and a right wing of doves. Interesting to compare it to the United States where the left wing are doves and the right wing hawks. What is the difference?
In our country Democrats favor the people and Republicans favor business. Generally speaking the Democrats worry about what can be done domestically to improve the lives of the public. That focus is more important to them than foreign policy which is complicated and takes money away from domestic needs. The Republicans favor a strong foreign policy because it protects their business interests -- more important to them than the needs of the people.