Evicting the defaulting tenant immediately if it is mentioned in the contract

Dear All,

I have the following question.

I am the landlord of an apartment in Dubai. It was rented out by me to a touristic company which now owes me 6 months rent payment. In the contract which we have signed we have the following clause:

"In case of any cheque returned unpaid without any valid reason from the tenant, and the tenant fails to settle the cheque value within 20 working days, then the tenant shall be entitled to a delayed penalty equal to 2% of the cheque value added to the due amount and if it is not settled after 7 working days from the date of penalty applied on the due cheque, then the owner has the right to terminate the contract and take immediate possession of the apartment."

So, does it mean that I can write an email to him and say that I am terminating the contract and taking possession of the apartment? Or do I still need to send some eviction notice?