Q.My Plum Tree Has No Leaves This Year Though It Has Leaf Buds And I Can See The Sap Has Risen
The leaf buds have only slightly swollen and show no green. I can see the sap collecting at the base of each bud
Certified GKH Gardening Expert
unfortunately, your photo did not come through. I am unable to see the issue.
I can say that many plums are only suited for our USDA zones 5-9. Most of your country is equivalent to our zone 9. Depending on the type of plum, it may not have received enough chill hours through the winter to come back out properly. Some are not as tolerant of lack of freezing weather as others.
Here is an article to help you with plum care:
https://www.gardeningknowhow.com/edible/fruits/plum/growing-plum-trees.htm