It would be literally my job to protect my country. So of course. Why an earth they would surrender?
As far as I know, Ukraine did not "declare war", simply had to defend the country in order for such country to continue existing as an individual entity with its own government. If your question is if it was a wise decision to fight such a defence, I think that given the situation and knowing what we now know, it was a reasonable decision.
Me I don't like war, but one can't say the same thing about others, they are some people who loves fighting, they just want to show their power, like what the Russia president is doing now, if it was to be me, I would have tried to talk peace, just to avoid my citizens losing their lives and properties. To my own understanding Ukraine didn't start the war, they just wanted to NATO and the Russia president knows the disadvantages of Ukraine NATO, the impact it will have in their economics, that's the reason for this war. that's just my own point of view.