the Angel from the East with the Seal of the Living God (R7.2-4)
This is the Angel with a specific task of God, to seal the 144,000 servants of the tribes of Israel (R7.1-8).
This Angel has the authority to command the other four (4) Angels who were granted power by God to harm the earth and the sea — which was to take place respectively when the Trumpet #1, Trumpet #2, Trumpet #3, and Trumpet #4, were to be sounded in sequential — NOT to harm the earth, the sea , or the trees till each and every of the 144,000 servants of all the tribes of Israel were sealed. (R7.2-4)
It is the grace and mercy of the Lord God to ensure the 144,000 servants of the tribes of Israel are sealed first, before the sounding of the 1st, 2nd, 3rd, and 4th trumpets.