President Vladimir Putin has hailed the Crimea region joining Russia as he visited the area for the first time since it was annexed from Ukraine in March.
Putin delivered a speech in the city of Sevastopol and watched a parade of Russian navy ships and a flyby of Russian aircraft which marked Victory Day - the World War Two defeat of Nazi Germany.
Ukraine has condemned Putin's visit as trampling on international law and deliberately escalating the crisis.
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Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.