Believe me this is not easier even for russian natives, even they do loads of mistakes in writing. there is no easy ways to gain a good writing - its only through hard reading, studying grammar and writing essays and if you have anyone who could correct it ,then you can better understand where is your weak point. 

I think it is easier to talk than to write russian. 

but to me in English and difficult to write and speak)))

I assume you mean conversation when you say "speak". There can be many reasons; I think it depends on the individual. If you often write, but rarely converse, for example. Or it might not even be true. When I first started writing Russian, I had already been conversing for 2 years, so writing was harder than conversing at that point.

But for people who have been doing both for a long time, I think it's often true because you have time to process your thoughts, use a dictionary, grammar, etc, when you write. You don't have this luxury when you converse, which can lead to more mistakes.

I think it's true regardless of language. Maybe in Russian we use a lot of idioms, sleng and complex sentences. And we don't have a fixed order of words in sentences. Meaning of the phrase is highly dependent on the alignment of semantic accents and a speaker's voice.