My guess - there might be 2 strategic reasons for him to do so:
Trigger early elections at the tine when no one expects it, e.g. when the best right-wing candidates have just becone EU MPs so they cannot run for the local parliament.
Trigger early elections now before his polls fall even further to the level that he won’t be able to set up any coalition to form the government.
Did he have to dissolve the Parliament?
Leftists don’t give up that easily.
My guess - there might be 2 strategic reasons for him to do so:
Trigger early elections at the tine when no one expects it, e.g. when the best right-wing candidates have just becone EU MPs so they cannot run for the local parliament.
Trigger early elections now before his polls fall even further to the level that he won’t be able to set up any coalition to form the government.