I think it is Fallopia baldschuanica common names are russian vine and 'a mile a minute'. it produces creamy white flowers. But it can get out of hand.

If it is Russian Vine it will take over before you can blink. I had one when I first came here in 1993 but soon realised it wasn't for me and it tooks years to get rid of it entirely. For me, it's like another bindweed.

I hope it isn't for your sake. It will push its way up through concrete & up through the cracks of those paving stones. It also makes a terrible mess when it flowers. Hopefully it is something else. If it is Russian bind weed get rid of it quick.