A world leader such as Tsar Nicholas II would, of course, have known of the Armenian massacres taking place.
The Russian Empire bordered on eastern Turkey, and the two powers were at war at the time.
George Ter-Markarian, the Armenian historian and publicist, wrote an account concerning this in Pravoslavnaya Rus', the church newspaper published by Holy Trinity Russian Orthodox Monastery, in Jordanville, NY. (No. 14, July 1968, pp. 6-7.)
It was part of a memorial article on the 50th anniversary of the murder of NII in Ekaterinburg.
Ter-Markarian relates that in the summer of 1915 crowds of exhausted Armenian refugees were massing on the Turkish-Russian border. For the most part, they were elderly people, women and children, and clergymen fleeing certain death. By personal order of Tsar Nicholas II the border was opened and the refugees were allowed to flee to the Russian side. There the troops guarding the border furnished them with what food and clothing they could. Then each refugee was given one silver ruble and a printed pass which allowed them to travel free on public transport anywhere in the Russian Empire for one year. They were to be allowed to take up residence wherever they wanted, and to practice the trade or craft of their choice.
Ter-Markarian estimates that all together more than 350,000 Armenians were saved by the Russians.
(Ter-Markarian was born in 1911 and came to the US in 1951. I do not have any further biographical information on him, other than the articles which appeared under his name in various other publications, such as Novoye Russkoye Slovo, in NYC, etc.)